Bug 14950 - tbench regression with 2.6.33-rc1
tbench regression with 2.6.33-rc1
Status: CLOSED OBSOLETE
Product: Process Management
Classification: Unclassified
Component: Other
All Linux
: P1 normal
Assigned To: process_other
:
Depends on:
Blocks: 14885
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Reported: 2009-12-29 14:09 UTC by Rafael J. Wysocki
Modified: 2012-06-14 17:03 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.33-rc1
Tree: Mainline
Regression: Yes


Attachments

Description Rafael J. Wysocki 2009-12-29 14:09:11 UTC
Subject    : tbench regression with 2.6.33-rc1
Submitter  : Lin Ming <ming.m.lin@intel.com>
Date       : 2009-12-25 11:11
References : http://marc.info/?l=linux-kernel&m=126174044213172&w=4
Notify-Also : Mike Galbraith <efault@gmx.de>

This entry is being used for tracking a regression from 2.6.32.  Please don't
close it until the problem is fixed in the mainline.
Comment 1 Rafael J. Wysocki 2010-02-02 20:45:11 UTC
On Monday 01 February 2010, Mike Galbraith wrote:
> On Mon, 2010-02-01 at 01:22 +0100, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> > 
> > The following bug entry is on the current list of known regressions
> > from 2.6.32.  Please verify if it still should be listed and let me know
> > (either way).
> 
> Yes, it should remain open.  Looking for places to trim overhead without
> injuring other things.  The regression is a moving target on my HW.
Comment 2 Rafael J. Wysocki 2010-03-22 21:31:50 UTC
On Monday 22 March 2010, Mike Galbraith wrote:
> 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.

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