Re: 2.4.20rc1 NFS V3 UDP client problems -- (not a problem now)

[Eric Whiting <ewhiting@amis.com>]

Ben, 

I found a 64Bit/66Mhz PCI bus and the jumbo frames are working fine.
Same 
kernel, same network cards, same Netapp 825 filer -- simply a different
motherboard.

Here are the NFS client read/write speeds for my setup.  The write
speeds appear to be somewhat limited by the netapps 825 disk/cpu speed.
I wish I had a netapps 9xx to test.

        TCP      UDP
READ    99MB/s  104MB/s
WRITE   36MB/s   49MB/s

UDP looks good with my current setup -- but with the gigE running jumbo
frames in the 32 bit PCI bus the UDP was sick on the reads -- 1MB/s.

Read testing is:
while(true);do mount blaa;dd if=path of=/dev/null bs=x count=y;umount
blaa;done
where bs/count equal a 500M file -- to use the netapps cache.

Write testing is:
dd if=/dev/zero of=file bs=1M

Network rates monitored using netapps syststat and the time results.

eric


Benjamin LaHaise wrote:
> I'd guess you're hitting the PCI bandwidth limitations then, as the larger
> packets permit greater throughput, which in turn drives up bus utilizations.
> If you've got any disk controllers on the same bus, that would definately
> explain the problem (or any other devices on the bus that are in use).
> 
>                 -ben


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