[Pvfs2-users] Pvfs performance over 10Ge

[Rob Ross]

How fast is the disk you're writing to? -- Rob

Salmon, Rene wrote:
> Hi,
> 
> Trying to benchmark pvfs running over 10ge.  I can run network
> benchmarks like netperf and iperf and get numbers fairly close to
> 10Gbits/sec  from any client to any of the pvfs servers.
> 
> When I try to run some dd's or pvfs2-cp's on the pvfs file system I seem
> to be reaching a 1Gbit/sec limit:
> 
> hpca4000(salmr0)60:pvfs2-cp -t -b 4194304 /pvfs2-fs/foo /pvfs2-fs/junk3
> Wrote 4194304000 bytes in 49.089332 seconds. 81.484099 MB/seconds
> 
> hpca4000(salmr0)61:/usr/bin/time -p dd if=/dev/zero of=/pvfs2-fs/foo2
> bs=4M count=1000
> 1000+0 records in
> 1000+0 records out
> 4194304000 bytes (4.2 GB) copied, 50.4064 seconds, 83.2 MB/s
> 
> Is there some hard coded limit with pvfs2 that assumes a 1Gbit/sec link
> or am I missing something here?
> 
> Thanks
> Rene
> 
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