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Date: Fri, 31 Oct 2008 09:15:43 +0800 From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@...el.com>, Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>, Roland McGrath <roland@...hat.com>, Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>, Yinghai Lu <yinghai@...nel.org> Subject: RE: cpu2000(both float and int) 13% regression with 2.6.28-rc1 On Thu, 2008-10-30 at 17:32 -0700, Pallipadi, Venkatesh wrote: > >-----Original Message----- > >From: linux-kernel-owner@...r.kernel.org > >[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Suresh Siddha > >Sent: Tuesday, October 28, 2008 1:27 PM > >To: Ingo Molnar > >Cc: Zhang, Yanmin; LKML; H. Peter Anvin; Siddha, Suresh B; > >Roland McGrath; Hiroshi Shimamoto; Yinghai Lu > >Subject: Re: cpu2000(both float and int) 13% regression with 2.6.28-rc1 > > > >On Tue, Oct 28, 2008 at 01:03:27AM -0700, Ingo Molnar wrote: > >> > >> * Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote: > >> > >> > Comparing with 2.6.27, cpu2000 (both float and int) has > >about 13% regression > >> > with 2.6.28-rc1 on my new-model x86-64 machine. > >> > > >> > I bisected down to below patch. > >> > > >> > commit 0afe2db21394820d32646a695eccf3fbfe6ab5c7 > >> > Merge: d847059... 43603c8... > >> > Author: Ingo Molnar <mingo@...e.hu> > >> > Date: Sat Oct 11 20:23:20 2008 +0200 > >> > > >> > Merge branch 'x86/unify-cpu-detect' into > >x86-v28-for-linus-phase4-D > >> > > >> > Conflicts: > >> > arch/x86/kernel/cpu/common.c > >> > arch/x86/kernel/signal_64.c > >> > include/asm-x86/cpufeature.h > >> > > >> > > >> > When I tried to revert it against 2.6.28-rc2, there are > >many conflictions. > > > >Ingo, I will work with Yanmin and report our findings. It is > >interesting to see > >double digit regression on cpu2000 benchmark. My understanding is that > >these benchmarks are not sensitive to signal handling. Also lmbench > >signal handling(lat_sig) has less than 3-4% regression, because of > >added overhead duing signal setup and restore. Context switch > >didn't have > >any noticeable difference, when I measure before. > > > > We figured out that this is not related to signals. But to this mismerge here > > > +#define X86_FEATURE_AMDC1E (3*32+21) /* AMD C1E detected */ > > + #define X86_FEATURE_XTOPOLOGY (3*32+21) /* cpu topology enum extensions */ > > I had earler sent a patch to fix this. > http://marc.info/?l=linux-kernel&m=122341178202930&w=2 > > But, somehow I don’t see this patch either in Linus's git or in tip. I confirm it does fix the issues. But the patch need to be ported to 2.6.28-rc2. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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