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Date: Mon, 24 Sep 2012 12:12:18 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Mike Galbraith <efault@....de> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Mel Gorman <mgorman@...e.de>, Borislav Petkov <bp@...en8.de>, Nikolay Ulyanitsky <lystor@...il.com>, linux-kernel@...r.kernel.org, Andreas Herrmann <andreas.herrmann3@....com>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Suresh Siddha <suresh.b.siddha@...el.com> Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected On Mon, Sep 24, 2012 at 11:26 AM, Mike Galbraith <efault@....de> wrote: > > Aside from the cache pollution I recall having been mentioned, on my > E5620, cross core is a tbench win over affine, cross thread is not. Oh, I agree with trying to avoid HT threads, the resource contention easily gets too bad. It's more a question of "if we have real cores with separate L1's but shared L2's, go with those first, before we start distributing it out to separate L2's". Linus -- 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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