linux-kernel - Re: [patch] rearrange kioctx and aio_ring

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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
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