From: Jens Axboe <jens.axboe@oracle.com>
To: Pawel S <spawels13@gmail.com>
Cc: linux-kernel@vger.kernel.org, Ben Gamari <bgamari.foss@gmail.com>,
tytso <tytso@mit.edu>, Nick Piggin <npiggin@suse.de>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing
Date: Tue, 23 Mar 2010 14:27:19 +0100 [thread overview]
Message-ID: <20100323132719.GY5768@kernel.dk> (raw)
In-Reply-To: <8c4cf08c1003230428t274b8ca8y13d67d65b8830dd7@mail.gmail.com>
On Tue, Mar 23 2010, Pawel S wrote:
> 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
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.
--
Jens Axboe
next prev parent reply other threads:[~2010-03-23 13:27 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-23 11:28 Poor interactive performance with I/O loads with fsync()ing Pawel S
2010-03-23 13:27 ` Jens Axboe [this message]
2010-03-26 3:35 ` Ben Gamari
2010-03-30 10:46 ` Pawel S
-- strict thread matches above, loose matches on Subject: below --
2010-03-16 15:31 Ben Gamari
2010-03-17 1:24 ` tytso
2010-03-17 3:18 ` Ben Gamari
2010-03-17 3:30 ` tytso
2010-03-17 4:31 ` Ben Gamari
2010-03-26 3:16 ` Ben Gamari
2010-03-17 4:53 ` Nick Piggin
2010-03-17 9:37 ` Ingo Molnar
2010-03-26 3:31 ` Ben Gamari
2010-04-09 15:21 ` Ben Gamari
2010-03-26 3:28 ` Ben Gamari
2010-03-23 19:51 ` Jesper Krogh
2010-03-26 3:13 ` Ben Gamari
2010-03-28 1:20 ` Ben Gamari
2010-03-28 1:29 ` Ben Gamari
2010-03-28 3:42 ` Arjan van de Ven
2010-03-28 14:06 ` Ben Gamari
2010-03-28 22:08 ` Andi Kleen
2010-04-09 14:56 ` Ben Gamari
2010-04-11 15:03 ` Avi Kivity
2010-04-11 16:35 ` Ben Gamari
2010-04-11 17:20 ` Andi Kleen
2010-04-11 18:16 ` Thomas Gleixner
2010-04-11 18:42 ` Andi Kleen
2010-04-11 21:54 ` Thomas Gleixner
2010-04-11 23:43 ` Hans-Peter Jansen
2010-04-12 0:22 ` Dave Chinner
2010-04-14 18:40 ` Ric Wheeler
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