From: Dave Jones <davej@redhat.com>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: "'Zach Brown'" <zach.brown@oracle.com>,
"'Suparna Bhattacharya'" <suparna@in.ibm.com>,
"Lahaise, Benjamin C" <benjamin.c.lahaise@intel.com>,
linux-kernel@vger.kernel.org, linux-aio <linux-aio@kvack.org>
Subject: Re: [patch] rearrange kioctx and aio_ring_info
Date: Thu, 12 Oct 2006 20:03:47 -0400 [thread overview]
Message-ID: <20061013000347.GA8673@redhat.com> (raw)
In-Reply-To: <000101c6ee55$c3e121a0$db34030a@amr.corp.intel.com>
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
next prev parent reply other threads:[~2006-10-13 0:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-12 23:25 [patch] rearrange kioctx and aio_ring_info Chen, Kenneth W
2006-10-12 23:38 ` Zach Brown
2006-10-12 23:41 ` Zach Brown
2006-10-13 0:03 ` Dave Jones [this message]
2006-10-13 0:20 ` Chen, Kenneth W
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