linux-kernel - Re: Poor interactive performance with I/O loads with fsync()ing

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Date:	Tue, 30 Mar 2010 12:46:34 +0200
From:	Pawel S <spawels13@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Ben Gamari <bgamari.foss@...il.com>,
	tytso <tytso@....edu>, Nick Piggin <npiggin@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing

2010/3/23 Jens Axboe <jens.axboe@...cle.com>:

> It's also been my sneaking suspicion that swap is involved. I had lots
> of RAM in anything I use, even the laptop and workstation. I'll try and
> run some tests with lower memory and force it into swap, I've seen nasty
> hangs that way.

I am not sure if the memory swapping is the case. According to KDE
System monitor swap is not even touched when copying files. I also
noticed similar responsiveness problems when extracting some rar files
- twelve parts , each about 100MB and the system becomes unresponsive
for some time since the first seconds of operation, then it behaves
normally and then problem is back. I have 2GB of RAM. I am using ext4
file system and I am using noatime mount option.

P.S. It seems it is a little better when I have AHCI mode set in BIOS
(at least when extracting archives).

P.S.2 I would be glad to provide some useful data. I created perf
chart, but if this is not enough just instruct me what should I do
next, please.

Regards

Pawel
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