[Pkg-ofed-devel] Setting mtu to 4k does not work

[Guy Coates]

> Any idea on how to resolve this issue? 

Hi Simon,

Google thinks that you need to configure your subnet manager to allow MTU > 2048.

Good starting points will be:

/usr/share/doc/opensm-doc/QoS_management_in_OpenSM.txt.gz

/usr/share/doc/ofed-docs/opensm_release_notes.txt.gz

and the opensm man page.

As far as I can tell, opensm does not ship with any example configuration files, 
so I don't know the exact options you need to give opensm.

If you do find some, let me know and I will add them to the future package releases.

Ipoib MTU size is discussed in:

/usr/share/doc/ofed-docs/ipoib_release_notes.txt.gz


>Is it even worth it?

No idea, I'm afraid. The linux IB mailing list might be able to help you, as 
well as answering any opensm config questions.

linux-rdma-owner at vger.kernel.org



Cheers,

Guy
-- 
Dr. Guy Coates,  Informatics System Group
The Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1HH, UK
Tel: +44 (0)1223 834244 x 6925
Fax: +44 (0)1223 496802


-- 
 The Wellcome Trust Sanger Institute is operated by Genome Research 
 Limited, a charity registered in England with number 1021457 and a 
 company registered in England with number 2742969, whose registered 
 office is 215 Euston Road, London, NW1 2BE.