[Lustre-discuss] lnet router tuning

Michael Kluge Michael.Kluge at tu-dresden.de
Fri Sep 10 08:42:10 PDT 2010

Hi Andreas,

Am 10.09.2010 um 16:35 schrieb Andreas Dilger:

> 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.

Ethernet back to back is at 950 MB/s. I have not looked at IB back to back yet.



Michael Kluge, M.Sc.

Technische Universität Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden

Willersbau, Room WIL A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

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