From: Simon Kirby <sim@hostway.ca>
To: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: linux-nfs@vger.kernel.org
Subject: Re: System CPU increasing on idle 2.6.36
Date: Wed, 8 Dec 2010 14:36:22 -0800 [thread overview]
Message-ID: <20101208223622.GA3796@hostway.ca> (raw)
In-Reply-To: <1291845189.3067.31.camel@heimdal.trondhjem.org>
On Wed, Dec 08, 2010 at 04:53:09PM -0500, Trond Myklebust wrote:
> Possibly a side effect of the fs/fs-writeback.c changes in 2.6.36? You
> do appear to be hitting a lot of spinlock contention, but I suspect that
> a lot of it is coming from writeback_sb_inodes, writeback_single_inode
> and queue_io, all of which seem unnaturally high on your stats above.
>
> I don't see how you can be seeing no traffic on the wire. You are
> certainly hitting some page writeout (0.2% nfs_pageio_doio).
It really seems to not be doing anything. I ran nfsstat -Zcv for 5
minutes, and the only non-zero counters are rpc calls and authrefrsh,
even though perf top shows similar profiles the whole time.
Simon-
next prev parent reply other threads:[~2010-12-08 22:36 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-08 21:25 System CPU increasing on idle 2.6.36 Simon Kirby
2010-12-08 21:53 ` Trond Myklebust
2010-12-08 22:36 ` Simon Kirby [this message]
2010-12-09 4:37 ` Trond Myklebust
2010-12-14 23:38 ` Simon Kirby
2010-12-15 1:10 ` Simon Kirby
2010-12-15 1:56 ` Simon Kirby
2010-12-15 18:08 ` J. Bruce Fields
2010-12-15 18:22 ` Trond Myklebust
2010-12-15 18:38 ` J. Bruce Fields
2010-12-15 19:33 ` Trond Myklebust
2010-12-15 19:49 ` J. Bruce Fields
2010-12-15 19:57 ` Trond Myklebust
2010-12-15 20:19 ` J. Bruce Fields
2010-12-15 20:32 ` Trond Myklebust
2010-12-15 21:48 ` J. Bruce Fields
2010-12-15 22:15 ` Trond Myklebust
2010-12-15 22:29 ` J. Bruce Fields
2010-12-15 22:55 ` J. Bruce Fields
2010-12-15 23:58 ` Trond Myklebust
2010-12-16 0:36 ` J. Bruce Fields
2011-09-27 0:39 ` NFS client growing system CPU Simon Kirby
2011-09-27 11:42 ` Trond Myklebust
2011-09-27 16:49 ` Simon Kirby
2011-09-27 17:04 ` Trond Myklebust
2011-09-28 19:58 ` Simon Kirby
2011-09-30 0:58 ` Simon Kirby
2011-09-30 1:11 ` Myklebust, Trond
2011-10-05 23:07 ` Simon Kirby
2010-12-18 1:08 ` System CPU increasing on idle 2.6.36 Simon Kirby
2010-12-21 20:31 ` Mark Moseley
2010-12-29 22:03 ` Simon Kirby
2011-01-04 17:42 ` Mark Moseley
2011-01-04 21:40 ` Simon Kirby
2011-01-05 19:43 ` Mark Moseley
2011-01-07 18:05 ` Mark Moseley
2011-01-07 18:12 ` Mark Moseley
2011-01-07 19:33 ` Mark Moseley
2011-01-08 0:52 ` Simon Kirby
2011-01-08 1:30 ` Mark Moseley
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