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SubjectRe: [Bug #14950] tbench regression with 2.6.33-rc1
FromMike Galbraith <>
DateMon, 22 Mar 2010 07:41:50 +0100
On Sun, 2010-03-21 at 21:30 +0100, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.32 and 2.6.33.
>
> The following bug entry is on the current list of known regressions
> introduced between 2.6.32 and 2.6.33. Please verify if it still should
> be listed and let the tracking team know (either way).
>
>
> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=14950
> Subject : tbench regression with 2.6.33-rc1
> Submitter : Lin Ming <ming.m.lin@intel.com>
> Date : 2009-12-25 11:11 (87 days old)
> References : http://marc.info/?l=linux-kernel&m=126174044213172&w=4

This needs retest in tip. I submitted some patchlets to shave a few
cycles, with which my box (fwtw) shows zero regression 2.6.31 ->
tip.today, whereas there was nothing but regression of up to ~6% in
between, magnitude seemingly depending on phase-of-moon. Actually,
patched tip at submission time was a fraction above 31 throughput.
Retesting today, it's a fraction of a percent below again (tbench is
annoyingly jittery).

Hopefully, this tbench regression is on it's way to retirement.

-Mike



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