From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: Jens Axboe <axboe@suse.de>, Vojtech Pavlik <vojtech@suse.cz>,
linux-raid <linux-raid@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Where is the performance bottleneck?
Date: Wed, 31 Aug 2005 22:24:25 +1000 [thread overview]
Message-ID: <4315A179.8070102@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.61.0508311029170.16574@diagnostix.dwd.de>
Holger Kiehl wrote:
> 3236497 total 1.4547
> 2507913 default_idle 52248.1875
> 158752 shrink_zone 43.3275
> 121584 copy_user_generic_c 3199.5789
> 34271 __wake_up_bit 713.9792
> 31131 __make_request 23.1629
> 22096 scsi_request_fn 18.4133
> 21915 rotate_reclaimable_page 80.5699
^^^^^^^^^
I don't think this function should be here. This indicates that
lots of writeout is happening due to pages falling off the end
of the LRU.
There was a bug recently causing memory estimates to be wrong
on Opterons that could cause this I think.
Can you send in 2 dumps of /proc/vmstat taken 10 seconds apart
while you're writing at full speed (with 2.6.13 or the latest
-git tree).
A dump of /proc/zoneinfo and /proc/meminfo while the write is
going on would be helpful too.
Thanks,
Nick
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2005-08-31 12:24 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-29 18:20 Where is the performance bottleneck? Holger Kiehl
2005-08-29 19:54 ` Mark Hahn
2005-08-30 19:08 ` Holger Kiehl
2005-08-30 23:05 ` Guy
2005-09-28 20:04 ` Bill Davidsen
2005-09-30 4:52 ` Guy
2005-09-30 5:19 ` dean gaudet
2005-10-06 21:15 ` Bill Davidsen
2005-08-29 20:10 ` Al Boldi
2005-08-30 19:18 ` Holger Kiehl
2005-08-31 10:30 ` Al Boldi
2005-08-29 23:09 ` Peter Chubb
[not found] ` <20050829202529.GA32214@midnight.suse.cz>
2005-08-30 20:06 ` Holger Kiehl
2005-08-31 7:11 ` Vojtech Pavlik
2005-08-31 7:26 ` Jens Axboe
2005-08-31 11:54 ` Holger Kiehl
2005-08-31 12:07 ` Jens Axboe
2005-08-31 13:55 ` Holger Kiehl
2005-08-31 14:24 ` Dr. David Alan Gilbert
2005-08-31 20:56 ` Holger Kiehl
2005-08-31 21:16 ` Dr. David Alan Gilbert
2005-08-31 16:20 ` Jens Axboe
2005-08-31 15:16 ` jmerkey
2005-08-31 16:58 ` Tom Callahan
2005-08-31 15:47 ` jmerkey
2005-08-31 17:11 ` Jens Axboe
2005-08-31 15:59 ` jmerkey
2005-08-31 17:32 ` Jens Axboe
2005-08-31 16:51 ` Holger Kiehl
2005-08-31 17:35 ` Jens Axboe
2005-08-31 19:00 ` Holger Kiehl
2005-08-31 18:06 ` Michael Tokarev
2005-08-31 18:52 ` Ming Zhang
2005-08-31 18:57 ` Ming Zhang
2005-08-31 12:24 ` Nick Piggin [this message]
2005-08-31 16:25 ` Holger Kiehl
2005-08-31 17:25 ` Nick Piggin
2005-08-31 21:57 ` Holger Kiehl
2005-09-01 9:12 ` Holger Kiehl
2005-09-02 14:28 ` Al Boldi
2005-08-31 13:38 ` Holger Kiehl
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