From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'Nick Piggin'" <nickpiggin@yahoo.com.au>
Cc: <linux-kernel@vger.kernel.org>
Subject: RE: bug in sched.c:task_hot()
Date: Tue, 5 Oct 2004 10:15:49 -0700 [thread overview]
Message-ID: <200410051715.i95HFh627747@unix-os.sc.intel.com> (raw)
In-Reply-To: <41621263.2000404@yahoo.com.au>
Nick Piggin wrote on Monday, October 04, 2004 8:18 PM
> >This bug causes large amount of incorrect process migration across
> >cpus (at stunning 10,000 per second) and we lost cache affinity very
> >quickly and almost took double digit performance regression on a db
> >transaction processing workload. Patch to fix the bug. Diff'ed against
> >2.6.9-rc3.
> >
>
> This one looks OK (the other may need a bit of rethinking).
> What kernel is the regression in relation to, out of interest?
Performance regression was initially seen on 2.6.8 relative to 2.6.6.
We subsequently narrowed down to these set of bugs.
- Ken
next prev parent reply other threads:[~2004-10-05 17:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-05 2:38 Chen, Kenneth W
2004-10-05 3:17 ` Nick Piggin
2004-10-05 17:15 ` Chen, Kenneth W [this message]
2004-10-05 7:33 ` Peter Williams
2004-10-05 7:44 ` Nick Piggin
2004-10-05 8:07 ` Peter Williams
2004-10-05 8:42 ` Nick Piggin
2004-10-05 10:03 ` Peter Williams
2004-10-05 17:39 ` Chen, Kenneth W
2004-10-05 22:09 ` Peter Williams
2004-10-05 8:03 ` Ingo Molnar
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