linux-kernel - Re: Swappiness vs. mmap() and interactive response

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Date:	Wed, 6 May 2009 20:04:24 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, Theodore Tso <tytso@....edu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Elladan <elladan@...imo.com>, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>
Subject: Re: Swappiness vs. mmap() and interactive response

> > test environment: no lvm, copy ext3 to ext3 (not mv), no change swappiness,
> >         CFQ is used, userland is Fedora10, mmotm(2.6.30-rc1 + mm patch),
> >         CPU opteronx4, mem 4G
> >
> > mouse move lag:        not happend
> > window move lag:       not happend
> > Mapped page decrease rapidly: not happend (I guess, these page stay in
> >                     active list on my system)
> > page fault large latency:   happend (latencytop display >1200ms)
> >
> >
> > Then, I don't doubt vm replacement logic now.
> > but I need more investigate.
> > I plan to try following thing today and tommorow.
> >
> > - XFS
> > - LVM
> > - another io scheduler (thanks Ted, good view point)
> > - Rik's new patch
> 
> hm, AS io-scheduler don't make such large latency on my environment.
> Elladan, Can you try to AS scheduler? (adding boot option "elevator=as")

second test result:
read dev(sda): SSD, lvm+XFS
write dev(sdb): HDD, lvm+XFS

the result is the same of ext3 without lvm. Thus I think
XFS isn't guilty.



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