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

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Message-ID: <8c4cf08c1003230428t274b8ca8y13d67d65b8830dd7@mail.gmail.com>
Date:	Tue, 23 Mar 2010 12:28:31 +0100
From:	Pawel S <spawels13@...il.com>
To:	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>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing

Hello

I am experiencing very similar issue. My system is a regular desktop
PC and it suffers from very high I/O latencies (sometimes desktop
"hangs" for eight seconds or more) when copying large files. I tried
kernels up to 2.6.34-rc2, but without luck. This issue was raised at
Phoronix forums and Arjan (from Intel) noticed it can be VM related:

http://www.phoronix.com/forums/showpost.php?p=114975&postcount=51

Here is my perf timechart where you can notice I/O "steals" CPU from
the other tasks:

http://hotfile.com/dl/30596827/ebe566b/output.svg.gz.html

Regards!

P.S. if there is some way I can help more just let me know please.
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