Kernel Bug Tracker – Bug 15192
netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f
Last modified: 2010-03-22 21:29:37 UTC
Subject : netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f
Submitter : Lin Ming <firstname.lastname@example.org>
Date : 2010-01-25 10:03
References : http://marc.info/?l=linux-kernel&m=126441481427331&w=4
Handled-By : Mike Galbraith <email@example.com>
Handled-By : Peter Zijlstra <firstname.lastname@example.org>
This entry is being used for tracking a regression from 2.6.. Please don't
close it until the problem is fixed in the mainline.
Bisection turned up:
Author: Mike Galbraith <email@example.com>
Date: Wed Nov 4 17:53:50 2009 +0100
sched: Rate-limit newidle
Rate limit newidle to migration_cost. It's a win for all
stages of sysbench oltp tests.
Signed-off-by: Mike Galbraith <firstname.lastname@example.org>
Signed-off-by: Ingo Molnar <email@example.com>
First-Bad-Commit : 1b9508f6831e10d53256825de8904caa22d1ca2c
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. We're currently waiting for some data from
> Lin Ming. The regression itself isn't making much sense.. a kernel with
> NEWIDLE disabled should show the same performance, but does not.
Sounds a lot like the bug I reported here:
Intel e1000e NIC in a Sun X6270 blade.
Patch : http://patchwork.kernel.org/patch/78544/
Handled-By : Venkatesh Pallipadi <firstname.lastname@example.org>
Fixed by commit d306ebc28649b89877a22158fe0076f06cc46f60 .