lucid has seen the end of its life and is no longer receiving any
updates. Marking the lucid task for this ticket as "Won't Fix".
** Changed in: linux (Ubuntu Lucid)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/727459
Title:
TSC is not reliable under Xen on some Intel CPUs
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Lucid:
Won't Fix
Status in linux source package in Trusty:
Triaged
Bug description:
SRU Justification
Impact: When applying the Xen patchset one endif seems to have gone to
the wrong place. So instead of not setting sched_clock_stable it is
done all the time.
Fix: Move endif so the whole code segment is covered.
Testcase: Can cause various effects and depends on CPU (see below).
Incorrect CPU time but likely also causing the unexplainable process
gets stuck or clone/fork issues.
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Ubuntu 10.04.2 LTS
Ubuntu 2.6.32-312.24-ec2 2.6.32.27+drm33.12
Linux 2.6.32-312-ec2 #24-Ubuntu SMP Fri Jan 7 18:30:50 UTC 2011 x86_64
GNU/Linux
We are experiencing impossibly high (thousands of days) accumulated
CPU times for processes in ps and top when using the above kernel on
Amazon EC2.
Instances running on Intel E5430 are fine, while instances on E5507 all seem
to have the problem.
Please see also https://bugzilla.kernel.org/show_bug.cgi?id=16314
Thanks,
Doug
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