[Bug 801151] Re: High idle CPU usage from udevd

[Garrett Sides]

I've figured out what triggers the high CPU usage, not sure how I never
noticed it before. Whenever a USB storage device (my flash drive, my
nook, or my phone, but not things like my printer) the problem starts
and persists until they are removed then the system is rebooted

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Title:
  High idle CPU usage from udevd

Status in “udev” package in Ubuntu:
  New

Bug description:
  It's happened before (since Natty was released) where the CPU fan
  would spin up and the CPU usage would rise (as I could see on Syspeek)
  and never come back down, in the past I thought it was from my
  meddling with Plymouth and Kernel setting, but on this Natty install
  neither of those things have been done. Now my CPU idles at 30-60%
  even with no other programs running, and the boot time has increased
  dramatically along with this problem.

  I ran top -n 1 | head -n 12 to look at the processes and their usage, which is what lead me to udev and here's the output:
  top - 09:17:27 up 37 min,  2 users,  load average: 0.81, 1.02, 1.01
  Tasks: 276 total,   2 running, 271 sleeping,   0 stopped,   3 zombie
  Cpu(s): 28.2%us,  9.6%sy,  0.9%ni, 55.7%id,  5.3%wa,  0.0%hi,  0.3%si,  0.0%st
  Mem:   7935908k total,  2560884k used,  5375024k free,   156648k buffers
  Swap:  8117244k total,        0k used,  8117244k free,   881148k cached

    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    570 root      16  -4  150m 130m  336 S   62  1.7  12:20.77 udevd
  22597 garrett   20   0  159m 5076 3076 S   23  0.1   6:35.66 gvfs-gdu-volume-monitor
    585 root      18  -2 21604 1040  352 S    8  0.0   2:32.60 udevd
  22616 root      20   0  134m 5236 3120 S    6  0.1   2:49.20 udisks-daemon
  23521 garrett   20   0  176m 8460 5708 S    6  0.1   2:22.04 gdu-notification-daemon

  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: udev 167-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: fglrx
  Architecture: amd64
  Date: Thu Jun 23 09:20:57 2011
  EcryptfsInUse: Yes
  ExecutablePath: /sbin/udevd
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Gateway DX4300
  ProcEnviron: PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=5fbe7f6c-4ae2-4959-b049-c135e717a12b ro quiet splash vt.handoff=7
  SourcePackage: udev
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/24/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P01-A1
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: RS780
  dmi.board.vendor: Gateway
  dmi.board.version: Rev 1.0
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gateway
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP01-A1:bd04/24/2009:svnGateway:pnDX4300:pvrP01-A1:rvnGateway:rnRS780:rvrRev1.0:cvnGateway:ct3:cvr1.0:
  dmi.product.name: DX4300
  dmi.product.version: P01-A1
  dmi.sys.vendor: Gateway

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