[Lustre-discuss] lnet router tuning

Andreas Dilger andreas.dilger at oracle.com
Fri Sep 10 07:35:42 PDT 2010

On 2010-09-10, at 08:23, Michael Kluge wrote:
> I have a Lustre 1.8.3 setup where I'd like to some lnet router performance tests with routing between DDR IB<->10GE networks. Currently I have three nodes, one with DDR IB, one with 10GE and one with both that does the routing. A first short lnet test shows 520-550 MB/s performance. 
> Has anyone an idea which of the variables of the lnet module are worth playing with to get this number a bit closer to 1GB/s? 

I would start by testing the performance on just the 10GigE side, and then separately on the IB side, to verify you are getting the expected performance from the components before trying them both together.  Often it is necessary to tune the ethernet send/receive buffers.

Cheers, Andreas
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.

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