linux-kernel - Re: unresponsiveness on linux desktop during file copy

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Message-ID: <93655eb70905160725u2ae9e11sec4abe9f95be18ed@mail.gmail.com>
Date:	Sat, 16 May 2009 19:55:09 +0530
From:	Satish Eerpini <eerpini@...il.com>
To:	Ray Lee <ray-lk@...rabbit.org>
Cc:	Rik van Riel <riel@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: unresponsiveness on linux desktop during file copy

> Which kernel version? If it's something recent, your programs may be
> getting swapped out due to a flaw in the latest kernels, where it
> accidentally prefers caching file data over mapped pages. If that's
> the case, Rik (cc:d) is working on patches to address the issue, and
> may appreciate another tester.

well I went through http://kerneltrap.org/node/3000 on kerneltrap ,
which I think is what you are pointing out here. Well I checked the
"swappiness" parameter on my system and it is set to 60 , and bravely
I changed it to '0', while the system appeared to have become a lot
more responsive, I see no difference in the statistics:

Linux 2.6.29.1 (satish) 	05/16/2009

07:49:43 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
07:49:46 PM     all      7.30      0.00            8.25         40.00
    0.00     44.44
07:49:49 PM     all      7.21      0.00            9.40          36.36
     0.00     47.02
07:49:52 PM     all      8.62      0.00            9.40          34.80
     0.00     47.18
07:49:55 PM     all      7.26      0.00            8.36          37.07
     0.00     47.32
07:49:58 PM     all      7.89      0.00           9.15           36.59
     0.00     46.37
Average:           all        7.66     0.00          8.92
36.96      0.00     46.47

so there is still a huge IOWAIT , ..


Cheers
Satish
-- 
http://satish.playdrupal.com
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