From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lin Ming Subject: Re: [Bug #15192] netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f Date: Sat, 20 Feb 2010 15:52:57 +0800 Message-ID: <1266652377.3464.6.camel@minggr.sh.intel.com> References: <1265011447.6220.15.camel@marge.simson.net> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1265011447.6220.15.camel-YqMYhexLQo1vAv1Ojkdn7Q@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Mike Galbraith Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Ingo Molnar , Peter Zijlstra , venkatesh.pallipadi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org On Mon, 2010-02-01 at 16:04 +0800, 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. (sorry for late response, I'm just back from vacation) We finally located this to a bug in mwait based C-state entry. Venki's patch has fixed it. http://patchwork.kernel.org/patch/78544/ Venki, this is the original report, http://marc.info/?l=linux-kernel&m=126441481427331&w=4 Thanks, Lin Ming