From: Brad Barnett <lists@L8R.net>
Subject: Re: knfsd brought to its knees, by a simple rsync or cp
 operation
Date: Wed, 2 Mar 2005 11:41:47 -0500
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Cc: Brad Barnett <lists@L8R.net>, nfs@lists.sourceforge.net
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To: Olaf Kirch <okir@suse.de>
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On Wed, 2 Mar 2005 10:03:13 +0100
Olaf Kirch <okir@suse.de> wrote:

> On Tue, Mar 01, 2005 at 06:10:07PM -0500, Brad Barnett wrote:
> > > Well, it sounds like something's eating the network bandwidth,
> > > or otherwise interfering with nfsd responsiveness. Again, are
> > > you using UDP or TCP? If UDP, look at nfsstat output to see if
> > > you have a high retransmit count.
> > > 
> > 
> > In my original post, I did mention that I can copy large files (isos)
> > over the network at excellent speeds.  That is, I get over 6M/sec
> > transfer speed...
> 
> Stil you won't answer: UDP or TCP? :-)

Sorry Olaf, heh.  UDP.

> 
> And the question about retransmits referred to the situation where you
> see the slow-downs.

I did check this before, in was in an NFS howto someplace, and I did not
notice a large number of retransmits (there were one or two per several
minutes)..

> 
> > > If it's really a problem with scheduling, it should make a
> > > difference if you run the rsync job with lower priority, and/or
> > > renice the nfsd threads to run with higher priority.
> > 
> > You can't really renice the kernel nfsd threads though :((
> 
> renice -20 -p <pid of nfsd> works for me.
> 

Right, but that doesn't effect anything in the kernel...

Anyhow, the problem is solved, please see my other message about changing
i/o schedulers...

Thanks!




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