[Lustre-discuss] read performance on ia64

[Kevin Van Maren]

What page size are you running on IA64?  What networking?

Kevin



Michel Dionne wrote:
> Hello all
>
> I am running test between an X4150 and SGI Altix with luster 1.6.6 and I
> can see a read performance drop on the SGI.
>
> Numbers:
> X4150
> dd if=/dev/zero of=/mnt/exec4_client_ib/mike/4/bigfile bs=4096k
> count=10000 (336MB/s) this a folder with a stripe of 4 for all tests
> dd if=/mnt/exec4_client_ib/mike/4/bigfile of=/dev/null bs=4096k
> (461MB/s)
>
> SGI Altix
> dd if=/dev/zero of=/mnt/exec4_client_ib/mike/4/bigfile bs=4096k
> count=2000 (371MB/s) 99% of the core is running dd
> dd if=/mnt/exec4_client_ib/mike/4/bigfile of=/dev/null bs=4096k
> (142MB/s) 20% is running dd and 80% is running ptlrpcd
>
>
> The X4140 is running:
> 2.6.18-92.1.10.el5_lustre.1.6.6smp #1 SMP Tue Aug 26 12:16:17 EDT 2008
> x86_64 x86_64 x86_64 GNU/Linux
> Red Hat Enterprise Linux Server release 5.2 (Tikanga)
>
> The SGI is running:
> SGI Altix systems 2.6.16.46-0.12-default #1 SMP Thu May 17 14:00:09 UTC 
> 2007	4 ia64 ia64 GNU/Linux
>
> cat /etc/issue
> Welcome to SUSE Linux Enterprise Server 10 SP1 (ia64)
>
> We compiled lustre 1.6.6 on the SGI  and everything works but the read
> performance is slowed down by the ptlrpcd.
>
> What should we look at to fix.
>
> Thanks
>
> Michel
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