[ewg] RE: [ofa-general] RE: OFED 1.2 beta blocking bugs

[Scott Weitzenkamp (sweitzen)]

Yes, it's limited to IPoIB CM.

I'm talking about IP multicast not IB multicast, so the hardware MTU
should be transparent.

I'll reopen bug 418, who shall I assign it to?

Scott 

> -----Original Message-----
> From: Sean Hefty [mailto:sean.hefty at intel.com] 
> Sent: Thursday, March 08, 2007 2:10 PM
> To: Scott Weitzenkamp (sweitzen); Sean Hefty; Michael S. Tsirkin
> Cc: Pavel Shamis; Openfabrics-ewg at openib.org; 
> general at lists.openfabrics.org; Vladimir Sokolovsky
> Subject: RE: [ofa-general] RE: OFED 1.2 beta blocking bugs
> 
> >There are also IPoIB CM IP multicast problems, see bug 418.
> 
> Bug 418 looks different than bug 400.
> 
> From the bug report, it sounds like this error is limited to 
> IPoIB CM mode.  Is
> this correct?
> 
> >If you try to multicast packets > 2KB, you see:
> 
> I'm not sure if your hardware supports a max MTU of 2K, but 
> in general I thought
> multicast would work up to 4K.  Can you verify that the 
> device MTU is higher
> than the packet size?
> 
> >ib0: failed send event (status=1, wrid=35 vend_err 69)
> 
> It looks like this indicates a local length error on the send.
> 
> >ib_mthca 0000:08:00.0: modify QP 3->3 returned status 10.
> >ib0: failed to modify QP, ret = -22
> >ib0: couldn't attach QP to multicast group
> 
> This looks like a RTS -> RTS QP transition to set the QKey.  
> I'm not sure what
> the ib_mthca status code of 10 is, but that may give us a 
> hint at the problem.
> This error and the attach QP to multicast group error may be related.
> 
> - Sean
>