linux-kernel - Re: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues

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Date:	Wed, 18 Apr 2007 20:52:33 -0500
From:	florin@...ha.net (Florin Iucha)
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Bunk <bunk@...sta.de>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues

On Wed, Apr 18, 2007 at 10:11:46AM -0400, Trond Myklebust wrote:
> Do you have a copy of wireshark or ethereal on hand? If so, could you
> take a look at whether or not any NFS traffic is going between the
> client and server once the hang happens?

I used the following command 

   tcpdump -w nfs-traffic -i eth0 -vv -tt dst port nfs

to capture

   http://iucha.net/nfs/21-rc7-nfs4/nfs-traffic.bz2

I started the capture before starting the copy and left it to run for
a few minutes after the traffic slowed to a crawl.

The iostat and vmstat are at:

   http://iucha.net/nfs/21-rc7-nfs4/iostat
   http://iucha.net/nfs/21-rc7-nfs4/vmstat
   
It seems that my original problem report had a big mistake!  There is
no hang, but at some point the write slows down to a trickle (from
40,000 blocks/s to 22 blocks/s) as can be seen from the iostat log.

Regards,
florin

-- 
Bruce Schneier expects the Spanish Inquisition.
      http://geekz.co.uk/schneierfacts/fact/163

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