[Lustre-discuss] RDMA limitation?

[Jiahua]

You mean it is inherent in the code? Can you point me to the actual
code if possible? I am just curious why. Any pointers or hints will be
appreciated.

Thanks,
Jiahua


On Tue, Apr 13, 2010 at 6:46 PM, Kevin Van Maren <Kevin.Vanmaren at sun.com> wrote:
> 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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>