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Message-ID: <20061013000347.GA8673@redhat.com> Date: Thu, 12 Oct 2006 20:03:47 -0400 From: Dave Jones <davej@...hat.com> To: "Chen, Kenneth W" <kenneth.w.chen@...el.com> Cc: "'Zach Brown'" <zach.brown@...cle.com>, "'Suparna Bhattacharya'" <suparna@...ibm.com>, "Lahaise, Benjamin C" <benjamin.c.lahaise@...el.com>, linux-kernel@...r.kernel.org, linux-aio <linux-aio@...ck.org> Subject: Re: [patch] rearrange kioctx and aio_ring_info On Thu, Oct 12, 2006 at 04:25:54PM -0700, Chen, Kenneth W wrote: > The following patch is result of our kernel data latency analysis on a > large database setup (128 logical CPU, 1 TB memory, a couple thousand > disks). The analysis is done at an individual cache line level through > hardware performance monitor unit. What we did essentially is to collect > data access latency on every kernel memory address and look for top 50 > longest average access latency. The hardware performance unit also keeps > track of instruction address for each collected data access. This allows > us to further associate each of the top 50 cache lines to instruction > sequences that caused long latency. Do you have performance numbers of before/after this change ? How much is it worth? Dave -- http://www.codemonkey.org.uk - 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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