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Date: Mon, 04 Jan 2010 13:57:34 +0100 From: Mike Galbraith <efault@....de> To: Arjan van de Ven <arjan@...radead.org> Cc: Lin Ming <ming.m.lin@...el.com>, Peter Zijlstra <peterz@...radead.org>, lkml <linux-kernel@...r.kernel.org>, "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> Subject: Re: volano ~30% regression with 2.6.33-rc1 & -rc2 On Mon, 2010-01-04 at 04:40 -0800, Arjan van de Ven wrote: > On Mon, 04 Jan 2010 16:15:58 +0800 > Lin Ming <ming.m.lin@...el.com> wrote: > > > Mike & Peter, > > > > Compared with 2.6.32, volano has ~30% regression with 2.6.33-rc1 & > > -rc2. Testing machine: Tigerton Xeon, 16cpus(4P/4Core), 16G memory > > did this show up only on this cpu? > (since this is a multi-core-without-shared-cache cpu, it could be that > we get the topology wrong and think cores share cache where they don't) My fault for using PREFER_SIBLING I guess. However, I do wonder why in the heck we set that at the CPU domain level. Siblings lie northward. -Mike -- 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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