RE: NFS Tuning
From: Brian D. McGrew (brian_at_visionpro.com)
Date: 03/16/05
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Date: Wed, 16 Mar 2005 08:44:57 -0800 To: "General Red Hat Linux discussion list" <redhat-list@redhat.com>
I'll try that right now, thanks!
Is there a way to change the rsize and wsize on the server end to force
the clients?
-brian
Brian D. McGrew { brian@visionpro.com || brian@doubledimension.com }
---
> YOU! Off my planet!
-----Original Message-----
From: redhat-list-bounces@redhat.com
[mailto:redhat-list-bounces@redhat.com] On Behalf Of James Cooley
Sent: Wednesday, March 16, 2005 8:43 AM
To: General Red Hat Linux discussion list
Subject: Re: NFS Tuning
Brian,
I've got a couple of ideas. The first one, is to try to improve your
send and receive packet sizes. This usually defaults to 4K, but 8K
tends to have a dramatic improvement on performance, and users commonly
set it using the rsize and wsize options like so when mounting from the
client-side:
mount -t nfs -o rsize=8192,wsize=8192 ...
If you have a more modern version of Linux at both ends, you can try
increasing the sizes even further.
Another possibility is to increase the size of the NFS memory buffers on
the server to say 256KB. On RHEL 4, the default is 128KB.
You can do this by using the following commands:
echo 262144 > /proc/sys/net/core/rmem_default
echo 262144 > /proc/sys/net/core/rmem_max
Thanks,
James Cooley
Brian D. McGrew wrote:
>Good morning,
>
>
>
>Can someone help me with tuning up NFS or point me to a good reference?
>I'm running several servers, RH7.3, RH9, Solaris 8 and FC3. We're
>getting absolutely terrible network performance and it's not just with
>NFS. However, I ran up ethereal on a few of the servers and in less
>then three minutes I captured over a million packets, of which 95.4%
>were UDP NFS packets. How do I go about turning up NFS? I know this
is
>way too much traffic for the size of our network and I'm at a complete
>loss as to what to do.
>
>
>
>Thanks,
>
>
>
>-brian
>
>
>
>Brian D. McGrew { brian@visionpro.com || brian@doubledimension.com }
>
>---
>
>
>
>>YOU! Off my planet!
>>
>>
>
>
>
>
>
--
--
James Cooley
Sr. Systems Analyst
Information Technology
Florida Tech
321-674-7999
jcooley@it.fit.edu
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