GET https://kbin.spritesserver.nl/index.php/m/linux@lemmy.ml/t/13046/The-Linux-kernel-has-been-accidentally-hardcoded-to-a-maximum/comment/124559/votes/up

Response
200 OK
IP
216.73.216.97
Profiled on
Token
ad6340

Security

Token

There is no security token.

Firewall

main Name
Security enabled
Stateless

Configuration

Key Value
provider security.user.provider.concrete.app_user_provider
context main
entry_point App\Security\KbinAuthenticator
user_checker App\Security\UserChecker
access_denied_handler (none)
access_denied_url (none)
authenticators 
[
  "two_factor"
  "remember_me"
  "App\Security\KbinAuthenticator"
  "App\Security\FacebookAuthenticator"
  "App\Security\GoogleAuthenticator"
  "App\Security\GithubAuthenticator"
  "App\Security\KeycloakAuthenticator"
]

Listeners

Listener Duration Response 
Symfony\Component\Security\Http\Firewall\ChannelListener {#723
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
  -logger: Monolog\Logger {#783 …}
  -httpPort: 80
  -httpsPort: 443
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\ContextListener {#706
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage {#1017 …}
  -sessionKey: "_security_main"
  -logger: Monolog\Logger {#783 …}
  -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …}
  -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
  -registered: false
  -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …}
  -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}
}
 22.52 ms (none) 
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584
  -authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}
}
 0.00 ms (none) 
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582
  -twoFactorFirewallConfig: Scheb\TwoFactorBundle\Security\TwoFactor\TwoFactorFirewallConfig {#842 …}
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}
}
 0.07 ms (none) 
Symfony\Component\Security\Http\Firewall\AccessListener {#579
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …}
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\LogoutListener {#786
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -options: [
    "csrf_parameter" => "_csrf_token"
    "csrf_token_id" => "logout"
    "logout_path" => "app_logout"
  ]
  -httpUtils: Symfony\Component\Security\Http\HttpUtils {#841 …}
  -csrfTokenManager: Symfony\Component\Security\Csrf\CsrfTokenManager {#1015 …}
  -eventDispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
}
 0.00 ms (none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy
# Voter class
1 
"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4 
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5 
"App\Security\Voter\EntryCommentVoter"
6 
"App\Security\Voter\EntryVoter"
7 
"App\Security\Voter\MagazineVoter"
8 
"App\Security\Voter\MessageThreadVoter"
9 
"App\Security\Voter\MessageVoter"
10 
"App\Security\Voter\NotificationVoter"
11 
"App\Security\Voter\OAuth2UserConsentVoter"
12 
"App\Security\Voter\PostCommentVoter"
13 
"App\Security\Voter\PostVoter"
14 
"App\Security\Voter\UserVoter"

Access decision log

# Result Attributes Object
1 DENIED ROLE_USER 
null
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
2 DENIED moderate 
App\Entity\EntryComment {#1374
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#320
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 73
    +apId: "linux@lemmy.ml"
    +apProfileId: "https://lemmy.ml/c/linux"
    +apPublicUrl: "https://lemmy.ml/c/linux"
    +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
    +apInboxUrl: "https://lemmy.ml/inbox"
    +apDomain: "lemmy.ml"
    +apPreferredUsername: "linux"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1729583596 {#321
      date: 2024-10-22 09:53:16.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1698929468 {#315
      date: 2023-11-02 13:51:08.0 +01:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    There’s a variable that contains the number of cores (called `cpus`) which is hardcoded to max out at 8, but it doesn’t mean that cores aren’t *utilized* beyond 8 cores–it just means that the scheduling scaling factor will not change in either the linear or logarithmic case once you go above that number:\n
    \n
    code snippet`/*  * Increase the granularity value when there are more CPUs,  * because with more CPUs the ‘effective latency’ as visible  * to users decreases. But the relationship is not linear,  * so pick a second-best guess by going with the log2 of the  * number of CPUs.  *  * This idea comes from the SD scheduler of Con Kolivas:  */ static unsigned int get_update_sysctl_factor(void) { \tunsigned int cpus = min_t(unsigned int, num_online_cpus(), 8); \tunsigned int factor;  \tswitch (sysctl_sched_tunable_scaling) { \tcase SCHED_TUNABLESCALING_NONE: \t\tfactor = 1; \t\tbreak; \tcase SCHED_TUNABLESCALING_LINEAR: \t\tfactor = cpus; \t\tbreak; \tcase SCHED_TUNABLESCALING_LOG: \tdefault: \t\tfactor = 1 + ilog2(cpus); \t\tbreak; \t}  \treturn factor; }`\n
    \n
    The core claim is this:\n
    \n
    > It’s problematic that the kernel was hardcoded to a maximum of 8 cores (scaling factor of 4). **It can’t be good to reschedule hundreds of tasks every few milliseconds, maybe on a different core, maybe on a different die. It can’t be good for performance and cache locality.**\n
    \n
    On this point, I have no idea (hope someone more knowledgeable will weigh in). But I’d say the headline is misleading at best.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 17
  +score: 0
  +lastActive: DateTime @1699988573 {#1769
    date: 2023-11-14 20:02:53.0 +01:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@madasi@lemmy.dbzer0.com"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2409 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2358 …}
  -id: 124559
  -bodyTs: "'1':146,161 '4':189 '8':20,32,132,184 'aren':28 'best':92,246 'beyond':31 'break':147,154,164 'cach':221 'call':11 'case':51,141,148,155 'chang':44 'claim':169 'code':58 'come':106 'con':112 'contain':6 'core':10,27,33,168,185,207 'cpus':12,68,72,103,124,131,153,163 'd':239 'decreas':80 'default':159 'die':212 'differ':206,211 'doesn':23 'effect':74 'either':46 'everi':200 'factor':41,120,135,145,152,160,166,187 'get':117 'go':54,95 'good':194,217 'granular':62 'guess':93 'hardcod':15,179 'headlin':242 'hope':230 'hundr':197 'idea':105,229 'ilog2':162 'increas':60 'int':116,123,128,134 'kernel':177 'knowledg':233 'koliva':113 'latenc':75 'linear':48,86,151 'local':222 'log':158 'log2':98 'logarithm':50 'max':17 'maximum':182 'mayb':203,208 'mean':25,36 'millisecond':202 'min':125 'mislead':244 'none':144 'num':129 'number':8,57,101 'onlin':130 'perform':219 'pick':88 'point':225 'problemat':174 'relationship':83 'reschedul':196 'return':165 'say':240 'scale':40,140,186 'sched':138,142,149,156 'schedul':39,110 'sd':109 'second':91 'second-best':90 'snippet':59 'someon':231 'static':114 'switch':136 'sysctl':119,137 'task':199 'tunabl':139 'tunablesc':143,150,157 'unsign':115,122,127,133 'updat':118 'user':79 'util':30 'valu':63 'variabl':4 'visibl':77 'void':121 'weigh':235"
  +ranking: 0
  +commentCount: 0
  +upVotes: 0
  +downVotes: 0
  +visibility: "visible             "
  +apId: "https://hexbear.net/comment/4250595"
  +editedAt: null
  +createdAt: DateTimeImmutable @1699988573 {#1969
    date: 2023-11-14 20:02:53.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
3 DENIED edit 
App\Entity\EntryComment {#1374
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#320
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 73
    +apId: "linux@lemmy.ml"
    +apProfileId: "https://lemmy.ml/c/linux"
    +apPublicUrl: "https://lemmy.ml/c/linux"
    +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
    +apInboxUrl: "https://lemmy.ml/inbox"
    +apDomain: "lemmy.ml"
    +apPreferredUsername: "linux"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1729583596 {#321
      date: 2024-10-22 09:53:16.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1698929468 {#315
      date: 2023-11-02 13:51:08.0 +01:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    There’s a variable that contains the number of cores (called `cpus`) which is hardcoded to max out at 8, but it doesn’t mean that cores aren’t *utilized* beyond 8 cores–it just means that the scheduling scaling factor will not change in either the linear or logarithmic case once you go above that number:\n
    \n
    code snippet`/*  * Increase the granularity value when there are more CPUs,  * because with more CPUs the ‘effective latency’ as visible  * to users decreases. But the relationship is not linear,  * so pick a second-best guess by going with the log2 of the  * number of CPUs.  *  * This idea comes from the SD scheduler of Con Kolivas:  */ static unsigned int get_update_sysctl_factor(void) { \tunsigned int cpus = min_t(unsigned int, num_online_cpus(), 8); \tunsigned int factor;  \tswitch (sysctl_sched_tunable_scaling) { \tcase SCHED_TUNABLESCALING_NONE: \t\tfactor = 1; \t\tbreak; \tcase SCHED_TUNABLESCALING_LINEAR: \t\tfactor = cpus; \t\tbreak; \tcase SCHED_TUNABLESCALING_LOG: \tdefault: \t\tfactor = 1 + ilog2(cpus); \t\tbreak; \t}  \treturn factor; }`\n
    \n
    The core claim is this:\n
    \n
    > It’s problematic that the kernel was hardcoded to a maximum of 8 cores (scaling factor of 4). **It can’t be good to reschedule hundreds of tasks every few milliseconds, maybe on a different core, maybe on a different die. It can’t be good for performance and cache locality.**\n
    \n
    On this point, I have no idea (hope someone more knowledgeable will weigh in). But I’d say the headline is misleading at best.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 17
  +score: 0
  +lastActive: DateTime @1699988573 {#1769
    date: 2023-11-14 20:02:53.0 +01:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@madasi@lemmy.dbzer0.com"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2409 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2358 …}
  -id: 124559
  -bodyTs: "'1':146,161 '4':189 '8':20,32,132,184 'aren':28 'best':92,246 'beyond':31 'break':147,154,164 'cach':221 'call':11 'case':51,141,148,155 'chang':44 'claim':169 'code':58 'come':106 'con':112 'contain':6 'core':10,27,33,168,185,207 'cpus':12,68,72,103,124,131,153,163 'd':239 'decreas':80 'default':159 'die':212 'differ':206,211 'doesn':23 'effect':74 'either':46 'everi':200 'factor':41,120,135,145,152,160,166,187 'get':117 'go':54,95 'good':194,217 'granular':62 'guess':93 'hardcod':15,179 'headlin':242 'hope':230 'hundr':197 'idea':105,229 'ilog2':162 'increas':60 'int':116,123,128,134 'kernel':177 'knowledg':233 'koliva':113 'latenc':75 'linear':48,86,151 'local':222 'log':158 'log2':98 'logarithm':50 'max':17 'maximum':182 'mayb':203,208 'mean':25,36 'millisecond':202 'min':125 'mislead':244 'none':144 'num':129 'number':8,57,101 'onlin':130 'perform':219 'pick':88 'point':225 'problemat':174 'relationship':83 'reschedul':196 'return':165 'say':240 'scale':40,140,186 'sched':138,142,149,156 'schedul':39,110 'sd':109 'second':91 'second-best':90 'snippet':59 'someon':231 'static':114 'switch':136 'sysctl':119,137 'task':199 'tunabl':139 'tunablesc':143,150,157 'unsign':115,122,127,133 'updat':118 'user':79 'util':30 'valu':63 'variabl':4 'visibl':77 'void':121 'weigh':235"
  +ranking: 0
  +commentCount: 0
  +upVotes: 0
  +downVotes: 0
  +visibility: "visible             "
  +apId: "https://hexbear.net/comment/4250595"
  +editedAt: null
  +createdAt: DateTimeImmutable @1699988573 {#1969
    date: 2023-11-14 20:02:53.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
4 DENIED moderate 
App\Entity\EntryComment {#1374
  +user: Proxies\__CG__\App\Entity\User {#1370 …}
  +entry: App\Entity\Entry {#1856 …}
  +magazine: App\Entity\Magazine {#312
    +icon: Proxies\__CG__\App\Entity\Image {#293 …}
    +name: "linux@lemmy.ml"
    +title: "linux"
    +description: """
      From Wikipedia, the free encyclopedia\n
      \n
      Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
      \n
      Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
      \n
      ### Rules\n
      \n
      - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
      - No misinformation\n
      - No NSFW content\n
      - No hate speech, bigotry, etc\n
      \n
      ### Related Communities\n
      \n
      - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
      - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
      - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
      - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
      \n
      Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
      """
    +rules: null
    +subscriptionsCount: 1
    +entryCount: 1406
    +entryCommentCount: 28632
    +postCount: 6
    +postCommentCount: 214
    +isAdult: false
    +customCss: null
    +lastActive: DateTime @1729583542 {#320
      date: 2024-10-22 09:52:22.0 +02:00
    }
    +markedForDeletionAt: null
    +tags: null
    +moderators: Doctrine\ORM\PersistentCollection {#284 …}
    +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
    +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
    +entries: Doctrine\ORM\PersistentCollection {#227 …}
    +posts: Doctrine\ORM\PersistentCollection {#185 …}
    +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
    +bans: Doctrine\ORM\PersistentCollection {#164 …}
    +reports: Doctrine\ORM\PersistentCollection {#150 …}
    +badges: Doctrine\ORM\PersistentCollection {#128 …}
    +logs: Doctrine\ORM\PersistentCollection {#118 …}
    +awards: Doctrine\ORM\PersistentCollection {#107 …}
    +categories: Doctrine\ORM\PersistentCollection {#94 …}
    -id: 73
    +apId: "linux@lemmy.ml"
    +apProfileId: "https://lemmy.ml/c/linux"
    +apPublicUrl: "https://lemmy.ml/c/linux"
    +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
    +apInboxUrl: "https://lemmy.ml/inbox"
    +apDomain: "lemmy.ml"
    +apPreferredUsername: "linux"
    +apDiscoverable: true
    +apManuallyApprovesFollowers: null
    +privateKey: null
    +publicKey: null
    +apFetchedAt: DateTime @1729583596 {#321
      date: 2024-10-22 09:53:16.0 +02:00
    }
    +apDeletedAt: null
    +apTimeoutAt: null
    +visibility: "visible             "
    +createdAt: DateTimeImmutable @1698929468 {#315
      date: 2023-11-02 13:51:08.0 +01:00
    }
  }
  +image: null
  +parent: null
  +root: null
  +body: """
    There’s a variable that contains the number of cores (called `cpus`) which is hardcoded to max out at 8, but it doesn’t mean that cores aren’t *utilized* beyond 8 cores–it just means that the scheduling scaling factor will not change in either the linear or logarithmic case once you go above that number:\n
    \n
    code snippet`/*  * Increase the granularity value when there are more CPUs,  * because with more CPUs the ‘effective latency’ as visible  * to users decreases. But the relationship is not linear,  * so pick a second-best guess by going with the log2 of the  * number of CPUs.  *  * This idea comes from the SD scheduler of Con Kolivas:  */ static unsigned int get_update_sysctl_factor(void) { \tunsigned int cpus = min_t(unsigned int, num_online_cpus(), 8); \tunsigned int factor;  \tswitch (sysctl_sched_tunable_scaling) { \tcase SCHED_TUNABLESCALING_NONE: \t\tfactor = 1; \t\tbreak; \tcase SCHED_TUNABLESCALING_LINEAR: \t\tfactor = cpus; \t\tbreak; \tcase SCHED_TUNABLESCALING_LOG: \tdefault: \t\tfactor = 1 + ilog2(cpus); \t\tbreak; \t}  \treturn factor; }`\n
    \n
    The core claim is this:\n
    \n
    > It’s problematic that the kernel was hardcoded to a maximum of 8 cores (scaling factor of 4). **It can’t be good to reschedule hundreds of tasks every few milliseconds, maybe on a different core, maybe on a different die. It can’t be good for performance and cache locality.**\n
    \n
    On this point, I have no idea (hope someone more knowledgeable will weigh in). But I’d say the headline is misleading at best.
    """
  +lang: "en"
  +isAdult: false
  +favouriteCount: 17
  +score: 0
  +lastActive: DateTime @1699988573 {#1769
    date: 2023-11-14 20:02:53.0 +01:00
  }
  +ip: null
  +tags: null
  +mentions: [
    "@madasi@lemmy.dbzer0.com"
  ]
  +children: Doctrine\ORM\PersistentCollection {#1371 …}
  +nested: Doctrine\ORM\PersistentCollection {#1379 …}
  +votes: Doctrine\ORM\PersistentCollection {#2446 …}
  +reports: Doctrine\ORM\PersistentCollection {#1891 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2409 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2358 …}
  -id: 124559
  -bodyTs: "'1':146,161 '4':189 '8':20,32,132,184 'aren':28 'best':92,246 'beyond':31 'break':147,154,164 'cach':221 'call':11 'case':51,141,148,155 'chang':44 'claim':169 'code':58 'come':106 'con':112 'contain':6 'core':10,27,33,168,185,207 'cpus':12,68,72,103,124,131,153,163 'd':239 'decreas':80 'default':159 'die':212 'differ':206,211 'doesn':23 'effect':74 'either':46 'everi':200 'factor':41,120,135,145,152,160,166,187 'get':117 'go':54,95 'good':194,217 'granular':62 'guess':93 'hardcod':15,179 'headlin':242 'hope':230 'hundr':197 'idea':105,229 'ilog2':162 'increas':60 'int':116,123,128,134 'kernel':177 'knowledg':233 'koliva':113 'latenc':75 'linear':48,86,151 'local':222 'log':158 'log2':98 'logarithm':50 'max':17 'maximum':182 'mayb':203,208 'mean':25,36 'millisecond':202 'min':125 'mislead':244 'none':144 'num':129 'number':8,57,101 'onlin':130 'perform':219 'pick':88 'point':225 'problemat':174 'relationship':83 'reschedul':196 'return':165 'say':240 'scale':40,140,186 'sched':138,142,149,156 'schedul':39,110 'sd':109 'second':91 'second-best':90 'snippet':59 'someon':231 'static':114 'switch':136 'sysctl':119,137 'task':199 'tunabl':139 'tunablesc':143,150,157 'unsign':115,122,127,133 'updat':118 'user':79 'util':30 'valu':63 'variabl':4 'visibl':77 'void':121 'weigh':235"
  +ranking: 0
  +commentCount: 0
  +upVotes: 0
  +downVotes: 0
  +visibility: "visible             "
  +apId: "https://hexbear.net/comment/4250595"
  +editedAt: null
  +createdAt: DateTimeImmutable @1699988573 {#1969
    date: 2023-11-14 20:02:53.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
5 DENIED edit 
App\Entity\Magazine {#312
  +icon: Proxies\__CG__\App\Entity\Image {#293 …}
  +name: "linux@lemmy.ml"
  +title: "linux"
  +description: """
    From Wikipedia, the free encyclopedia\n
    \n
    Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).\n
    \n
    Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.\n
    \n
    ### Rules\n
    \n
    - Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.\n
    - No misinformation\n
    - No NSFW content\n
    - No hate speech, bigotry, etc\n
    \n
    ### Related Communities\n
    \n
    - [!opensource@lemmy.ml](https://lemmy.ml/c/opensource)\n
    - [!libre_culture@lemmy.ml](https://lemmy.ml/c/libre_culture)\n
    - [!technology@lemmy.ml](https://lemmy.ml/c/technology)\n
    - [!libre_hardware@lemmy.ml](https://lemmy.ml/c/libre_hardware)\n
    \n
    Community icon by [Alpár-Etele Méder](https://www.iconfinder.com/pocike), licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
    """
  +rules: null
  +subscriptionsCount: 1
  +entryCount: 1406
  +entryCommentCount: 28632
  +postCount: 6
  +postCommentCount: 214
  +isAdult: false
  +customCss: null
  +lastActive: DateTime @1729583542 {#320
    date: 2024-10-22 09:52:22.0 +02:00
  }
  +markedForDeletionAt: null
  +tags: null
  +moderators: Doctrine\ORM\PersistentCollection {#284 …}
  +ownershipRequests: Doctrine\ORM\PersistentCollection {#280 …}
  +moderatorRequests: Doctrine\ORM\PersistentCollection {#269 …}
  +entries: Doctrine\ORM\PersistentCollection {#227 …}
  +posts: Doctrine\ORM\PersistentCollection {#185 …}
  +subscriptions: Doctrine\ORM\PersistentCollection {#247 …}
  +bans: Doctrine\ORM\PersistentCollection {#164 …}
  +reports: Doctrine\ORM\PersistentCollection {#150 …}
  +badges: Doctrine\ORM\PersistentCollection {#128 …}
  +logs: Doctrine\ORM\PersistentCollection {#118 …}
  +awards: Doctrine\ORM\PersistentCollection {#107 …}
  +categories: Doctrine\ORM\PersistentCollection {#94 …}
  -id: 73
  +apId: "linux@lemmy.ml"
  +apProfileId: "https://lemmy.ml/c/linux"
  +apPublicUrl: "https://lemmy.ml/c/linux"
  +apFollowersUrl: "https://lemmy.ml/c/linux/followers"
  +apInboxUrl: "https://lemmy.ml/inbox"
  +apDomain: "lemmy.ml"
  +apPreferredUsername: "linux"
  +apDiscoverable: true
  +apManuallyApprovesFollowers: null
  +privateKey: null
  +publicKey: null
  +apFetchedAt: DateTime @1729583596 {#321
    date: 2024-10-22 09:53:16.0 +02:00
  }
  +apDeletedAt: null
  +apTimeoutAt: null
  +visibility: "visible             "
  +createdAt: DateTimeImmutable @1698929468 {#315
    date: 2023-11-02 13:51:08.0 +01:00
  }
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS DENIED 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details