I'm not sure if this is a bug or what, but I am experiencing severe
performace problems between an IA64 NFS server and IA32 NFS client. I
have tried every combination of socket buffer sizes as well as many
other nfs options, but none of them seem to have any effect. I have
tried RHEL21 to RHEL3U5 with all of these socket combos and still no
difference. The command I am running is:
time dd if=/dev/zero of=/scratch_dir_across_nfs bs=1M count=128
Between two IA32 machines this takes 4-5 seconds. Between IA64 server
and IA32 client this takes on the order of minutes. Network performance
has been eliminated from the equation as after kernel tuning we have
achieved consistent 94% of peak tcp throughput and 95.7% of peak udp
throughput on our GigE network. This is both between IA32 and IA64
systems.
Let me know if there is an other info I should provide to help
troubleshoot this problem.
Any help is appreciated.
Thanks, Brett P
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Well, for starters, how about looking over:
http://dcs.nac.uci.edu/~strombrg/NFS-troubleshooting-2.html
http://dcs.nac.uci.edu/~strombrg/network-performance.html
If anyone has any suggestions on how to improve these documents,
-please-do- suggest away. :)
On Wed, 2005-07-20 at 16:37 -0600, Brett Petrusek wrote:
> I'm not sure if this is a bug or what, but I am experiencing severe
> performace problems between an IA64 NFS server and IA32 NFS client. I
> have tried every combination of socket buffer sizes as well as many
> other nfs options, but none of them seem to have any effect. I have
> tried RHEL21 to RHEL3U5 with all of these socket combos and still no
> difference. The command I am running is:
>
> time dd if=/dev/zero of=/scratch_dir_across_nfs bs=1M count=128
>
> Between two IA32 machines this takes 4-5 seconds. Between IA64 server
> and IA32 client this takes on the order of minutes. Network performance
> has been eliminated from the equation as after kernel tuning we have
> achieved consistent 94% of peak tcp throughput and 95.7% of peak udp
> throughput on our GigE network. This is both between IA32 and IA64
> systems.
>
> Let me know if there is an other info I should provide to help
> troubleshoot this problem.
>
> Any help is appreciated.
> Thanks, Brett P
>
>
> -------------------------------------------------------
> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
> from IBM. Find simple to follow Roadmaps, straightforward articles,
> informative Webcasts and more! Get everything you need to get up to
> speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
> _______________________________________________
> NFS maillist - [email protected]
> https://lists.sourceforge.net/lists/listinfo/nfs
>