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

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Date:	Thu, 30 Apr 2009 20:59:59 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Theodore Tso <tytso@....edu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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")
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