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[Bug 623325] Re: Number of CPUs in linux-generic-pae


Christian Nygaard, thank you for reporting this and helping make Ubuntu better. As of Trusty this would still be 8:
git clone git://kernel.ubuntu.com/ubuntu/ubuntu-trusty.git && grep -r CONFIG_NR_CPUS= | grep i386

I'll mark this Triaged for now, so this request could be further

As well, could you please provide a full detail on why you are making
this request? Is this just a general "it would be nice..." or would you
have a requirement in your environment for PAE, that migrating to amd64
would be too onerous?

Despite this, from the perspective of just one data point, if one is
utilizing 8+ cores, then it may be best to switch to the amd64 version
of the kernel for performance reasons ->

** Changed in: linux (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Summary changed:

- Number of CPUs in linux-generic-pae
+ Request increase CONFG_NR_CPUS= higher than 8 for linux-generic-pae

** Tags removed: needs-upstream-testing
** Tags added: trusty

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  Request increase CONFG_NR_CPUS= higher than 8 for linux-generic-pae

Status in “linux” package in Ubuntu:

Bug description:
  Binary package hint: linux-generic-pae

  In linux-generic-pae 32-bit kernel the config parameter CONFIG_NR_CPUS=8 is set to 8 this is to little for modern multicore CPUs. Suggestion is that this parameter is set to either 32 or 64. CONFIG_NR_CPUS=64 is the value used in the 64-bit kernel.

  Steps to reproduce: 
  $ grep CONFIG_NR_CPUS /boot/config-2.6.32-24-generic-pae


  uname -a output:
  Linux ubuntu 2.6.32-24-generic-pae #39-Ubuntu SMP Wed Jul 28 07:39:26 UTC 2010 i686 GNU/Linux

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-generic-pae
  Regression: No
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-24.39-generic-pae
  Uname: Linux 2.6.32-24-generic-pae i686
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: aplay: device_list:223: no soundcards found...
  Architecture: i386
  ArecordDevices: arecord: device_list:223: no soundcards found...
  Date: Tue Aug 24 13:25:34 2010
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
  MachineType: Supermicro X8DTU
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic-pae root=UUID=6676f6ff-18ff-47cd-baca-d6a638a1b800 ro quiet splash
   PATH=(custom, no user)
  SourcePackage: linux
  UdevDb: Error: [Errno 2] Filen eller katalogen finns inte
  dmi.bios.date: 05/28/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: X8DTU
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd05/28/2010:svnSupermicro:pnX8DTU:pvr1234567890:rvnSupermicro:rnX8DTU:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DTU
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

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