[Bugme-new] [Bug 12362] New: Extremely high cpu usage and temps starting 2.6.25

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Mon Jan 5 03:22:43 PST 2009


http://bugzilla.kernel.org/show_bug.cgi?id=12362

           Summary: Extremely high cpu usage and temps starting 2.6.25
           Product: Platform Specific/Hardware
           Version: 2.5
     KernelVersion: 2.6.28
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: x86-64
        AssignedTo: platform_x86_64 at kernel-bugs.osdl.org
        ReportedBy: curaga at operamail.com


Latest working kernel version: 2.6.24
Earliest failing kernel version: 2.6.25
Distribution: None
Hardware Environment: X86_64
Software Environment: pure 64-bit software
Problem Description: Starting with 2.6.25, my CPU temperatures are reported as
55C when idle (30C in 2.6.24). Load avg stays over 0.5 even when completely
idle, and mpg123 takes 38% of cpu when it took 3% in 2.6.24 (from top).

While the temperature readings of coretemp might be wrong in all kernels,
afterall .24 claims using undocumented features and .25-.28 claim to use a
relative scale, the cpu usage of all processes has greatly increased starting
with .25 kernel.

I have tried various configs with .25, .26, and .28, both identical with my .24
config and variations such as enabling tickless, hpet, and using different IO
schedulers etc. No matter the config, all kernels starting .25 show this huge
cpu usage in all processes.

I'm not at all sure what causes this, so marking as platform-specific.

Pentium Dual Core E2160 overclocked to 3Ghz

Steps to reproduce: Boot a 64-bit kernel 2.6.25 or later


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