[Lustre-discuss] RDMA limitation?

[Kevin Van Maren]

Yes, the RPC rate is limited by Lustre code locking to that rate, even  
with rdma.

Kevin


On Apr 13, 2010, at 5:08 PM, Jiahua <jiahua at gmail.com> wrote:

> Hi all,
>
> This is kind of a followup question of the thread "One or two OSS, no
> difference?" last month. In that thread, Andreas stated:
>
> "There is work currently underway to improve the SMP scaling
> performance for the RPC handling layer in Lustre.  Currently that
> limits the delivered RPC rate to 10-15k/sec or so."
>
> My question is: is the limitation also applied to RDMA on IB? By SMP,
> I guess Andreas was talking about CPU, right? Since RDMA can bypass
> the host CPU, does it mean it can also bypass the limitation?
>
> Thanks,
> Jiahua
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