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Date: Tue, 25 Sep 2012 03:57:38 +0200 From: Mike Galbraith <efault@....de> To: Borislav Petkov <bp@...en8.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Mel Gorman <mgorman@...e.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, 2012-09-24 at 21:20 +0200, Borislav Petkov wrote: > On Mon, Sep 24, 2012 at 12:12:18PM -0700, Linus Torvalds wrote: > > 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". > > Yes, this is exactly what I meant before. We basically want to avoid > unnecessary, high-volume probe traffic over the L3 or memory controller, > if possible. > > So, trying harder to select an L2 sibling would be more beneficial, > IMHO, instead of scanning the whole node. If those L2 siblings are cores, oh yeah. Do any modern packages have multi-core shared L2? -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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