kernel-packages team mailing list archive
Mailing list archive
[Bug 727459] Re: TSC is not reliable under Xen on some Intel CPUs
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
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
TSC is not reliable under Xen on some Intel CPUs
Status in linux package in Ubuntu:
Status in linux source package in Lucid:
Status in linux source package in Trusty:
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.
Ubuntu 10.04.2 LTS
Ubuntu 2.6.32-312.24-ec2 220.127.116.11+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
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
To manage notifications about this bug go to: