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From: Dave Chinner <david@fromorbit.com>
To: Mark Lord <kernel@teksavvy.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	xfs@oss.sgi.com, Linux Kernel <linux-kernel@vger.kernel.org>,
	Alex Elder <aelder@sgi.com>
Subject: Re: xfs: very slow after mount, very slow at umount
Date: Fri, 28 Jan 2011 10:39:29 +1100	[thread overview]
Message-ID: <20110127233929.GM21311@dastard> (raw)
In-Reply-To: <4D40EB2F.2050809@teksavvy.com>

On Wed, Jan 26, 2011 at 10:49:03PM -0500, Mark Lord wrote:
> On 11-01-26 10:30 PM, Dave Chinner wrote:
> > [Please cc xfs@oss.sgi.com on XFS bug reports. Added.]
> >
> > On Wed, Jan 26, 2011 at 08:22:25PM -0500, Mark Lord wrote:
> >> Alex / Christoph,
> >>
> >> My mythtv box here uses XFS on a 2TB drive for storing recordings and videos.
> >> It is behaving rather strangely though, and has gotten worse recently.
> >> Here is what I see happening:
> >>
> >> The drive mounts fine at boot, but the very first attempt to write a new file
> >> to the filesystem suffers from a very very long pause, 30-60 seconds, during which
> >> time the disk activity light is fully "on".
> >
> > Please post the output of xfs_info <mtpt> so we can see what you
> > filesystem configuration is.
> 
>    /dev/sdb1 on /var/lib/mythtv type xfs
> (rw,noatime,allocsize=64M,logbufs=8,largeio)
> 
>    [~] xfs_info /var/lib/mythtv
>    meta-data=/dev/sdb1              isize=256    agcount=7453, agsize=65536 blks
>             =                       sectsz=512   attr=2
>    data     =                       bsize=4096   blocks=488378638, imaxpct=5
>             =                       sunit=0      swidth=0 blks
>    naming   =version 2              bsize=4096   ascii-ci=0
>    log      =internal               bsize=4096   blocks=32768, version=2
>             =                       sectsz=512   sunit=0 blks, lazy-count=0
>    realtime =none                   extsz=4096   blocks=0, rtextents=0

7453 AGs means that the first write coud cause up to ~7500 disk
reads to occur as the AGF headers are read in to find where the
best free space extent for allocation lies.

That'll be your problem.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  parent reply	other threads:[~2011-01-27 23:37 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <4D40C8D1.8090202@teksavvy.com>
2011-01-27  3:30 ` xfs: very slow after mount, very slow at umount Dave Chinner
2011-01-27  3:49   ` Mark Lord
2011-01-27  5:17     ` Stan Hoeppner
2011-01-27 15:12     ` Mark Lord
2011-01-27 15:40       ` Justin Piszcz
2011-01-27 16:03         ` Mark Lord
2011-01-27 19:40           ` Stan Hoeppner
2011-01-27 20:11             ` david
2011-01-27 23:53               ` Stan Hoeppner
2011-01-28  2:09                 ` david
2011-01-28 13:56                   ` Dave Chinner
2011-01-28 19:26                     ` david
2011-01-29  5:40                       ` Dave Chinner
2011-01-29  6:08                         ` david
2011-01-29  7:35                           ` Dave Chinner
2011-01-31 19:17                             ` Christoph Hellwig
2011-01-27 21:56             ` Mark Lord
2011-01-28  0:17               ` Dave Chinner
2011-01-28  1:22                 ` Mark Lord
2011-01-28  1:36                   ` Mark Lord
2011-01-28  4:14                   ` David Rees
2011-01-28 14:22                     ` Mark Lord
2011-01-28  7:31                   ` Dave Chinner
2011-01-28 14:33                     ` Mark Lord
2011-01-28 23:58                       ` Dave Chinner
2011-01-28 19:18             ` Martin Steigerwald
2011-01-27 20:24           ` John Stoffel
2011-01-27 23:41       ` Dave Chinner
2011-01-28  0:59         ` Mark Lord
2011-01-27 23:39     ` Dave Chinner [this message]
     [not found] ` <4D40CDCF.4010301@teksavvy.com>
2011-01-27  3:43   ` Dave Chinner
2011-01-27  3:53     ` Mark Lord
2011-01-27  4:54       ` Mark Lord
2011-01-27 23:34       ` Dave Chinner

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