linux-kernel - RE: [PATCH 4/4] zone_reclaim

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Message-ID: <4D05DB80B95B23498C72C700BD6C2E0B2EF6E465@pdsmsx502.ccr.corp.intel.com>
Date:	Tue, 19 May 2009 15:15:44 +0800
From:	"Zhang, Yanmin" <yanmin.zhang@...el.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: RE: [PATCH 4/4] zone_reclaim_mode is always 0 by default

>>-----Original Message-----
>>From: KOSAKI Motohiro [mailto:kosaki.motohiro@...fujitsu.com]
>>Sent: 2009年5月19日 15:10
>>To: Zhang, Yanmin
>>Cc: kosaki.motohiro@...fujitsu.com; Wu, Fengguang; LKML; linux-mm; Andrew
>>Morton; Rik van Riel; Christoph Lameter
>>Subject: Re: [PATCH 4/4] zone_reclaim_mode is always 0 by default
>>
>>Hi
>>
>>> >>> >>Now, it was breaked. What should we do?
>>> >>> >>Yanmin, We know 99% linux people use intel cpu and you are one of
>>> >>> >>most hard repeated testing
>>> >>> [YM] It's very easy to reproduce them on my machines. :) Sometimes, because
>>> >>the
>>> >>> issues only exist on machines with lots of cpu while other community
>>> >>developers
>>> >>> have no such environments.
>>> >>>
>>> >>>
>>> >>>  guy in lkml and you have much test.
>>> >>> >>May I ask your tested machine and benchmark?
>>> >>> [YM] Usually I started lots of benchmark testing against the latest
>>> >>
>>> >>Yeah, that's ok. I and cristoph have. My worries is my unknown workload
>>become
>>> >>regression.
>>> >>so, May I assume you run your benchmark both zonre reclaim 0 and 1 and you
>>> >>haven't seen regression by non-zone reclaim mode?
>>> [YM] what is non-zone reclaim mode? When zone_reclaim_mode=0?
>>> I didn't do that intentionally. Currently I just make sure FIO has a big drop
>>>  when zone_reclaim_mode=1. I might test it with other benchmarks on 2 Nehalem
>>machines.
>>

>>May I ask what is FIO?
>>File IO?
[YM] fio is a tool to test I/O. Jens Axboe is the author.