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 08:42:26 -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 09:15:31AM -0400, Trond Myklebust wrote:
> There is only one request on the 'pending' queue. That would usually
> indicate that the connection to the server is down. Can you check using
> "netstat -t" whether or not there is a connection in the 'ESTABLISHED'
> state to the server? Please also repeat the command a couple of times in
> order to see if the socket/port number on the connection changes.

This is with your fifth patch on top of the previous four patches:

   http://iucha.net/nfs/21-rc7-nfs3/big-copy

Again, it has memory, stack traces and rpc_debug.

The iostat 5 output:

   http://iucha.net/nfs/21-rc7-nfs3/iostat

The netstat outputs are stable (not changed in 5 minutes):

   http://iucha.net/nfs/21-rc7-nfs3/netstat-server :

tcp        1      0 hermes.iucha.org:nfs    zeus.iucha.org:799      CLOSE_WAIT 
tcp        0      0 hermes.iucha.org:nfs    zeus.iucha.org:976      ESTABLISHED

   http://iucha.net/nfs/21-rc7-nfs3/netstat-client

Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 zeus.iucha.org:976      hermes.iucha.org:nfs    ESTABLISHED
tcp        0      0 zeus.iucha.org:ssh      hermes.iucha.org:56880  ESTABLISHED
tcp        0      0 zeus.iucha.org:ssh      hermes.iucha.org:45176  ESTABLISHED

Could the port in CLOSE_WAIT state be the culprit?  (FWIW
the server has been up for 38 days and subjected to
this nfs test quite a bit without showing any stress).

Regards,
florin

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

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