[openib-general] Performance Degradation with OFED v. Voltaire(lustre)

[Bernadat, Philippe]

Or,

I did manage to fix it my way, by inserting this same

route->path_rec->mtu = IB_MTU_1024;

Before/after qp creation
Before/after accept
Before/after connect

So not sure which one really fixes it.

Philippe

 

> -----Original Message-----
> From: Bernadat, Philippe 
> Sent: Monday, December 18, 2006 2:42 PM
> To: Or Gerlitz
> Cc: Hal Rosenstock; Eitan Zahavi; Roland Dreier; 
> openib-general at openib.org
> Subject: RE: [openib-general] Performance Degradation with 
> OFED v. Voltaire(lustre)
> 
> I have tried both fiexs, none of these  improve performance ... 
> Let me check the number of packets again.
> 
> Philippe 
> 
> > -----Original Message-----
> > From: Or Gerlitz [mailto:ogerlitz at voltaire.com] 
> > Sent: Monday, December 18, 2006 2:03 PM
> > To: Bernadat, Philippe
> > Cc: Hal Rosenstock; Eitan Zahavi; Roland Dreier; 
> > openib-general at openib.org
> > Subject: Re: [openib-general] Performance Degradation with 
> > OFED v. Voltaire(lustre)
> > 
> > Bernadat, Philippe wrote:
> > > 3) Is there a way to change the MTU from within the lustre 
> > LND kernel
> > > module. I saw that the IB perf programs did this with the 
> > modify_qp()
> > > APIs.
> > 
> > yes, go to the place where the lustre NLD active side gets 
> > RDMA_CM_EVENT_ROUTE_RESOLVED event on its rdma cm id and then set
> > 
> > 	lustre_id->route->path_rec->mtu = IB_MTU_1024;
> > 
> > Or.
> > 
> > 
> > 
> >