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

[Bernadat, Philippe]

So Roland, what is this subtle difference that remains ?

>>> [root at axis21_EL4_u3 o2ib]$ diff lspci_axis19_vib lspci_axis21_ofed 
>>> 39c39
>>> < 50: 03 60 ff ff 11 11 00 00 00 00 00 00 00 00 00 00
>>> ---
>>>       
>>> > 50: 03 60 ff 7f 11 11 00 00 00 00 00 00 00 00 00 00
>>>>         

Philippe

> -----Original Message-----
> From: Roland Dreier [mailto:rdreier at cisco.com] 
> Sent: Thursday, December 14, 2006 5:06 PM
> To: Bernadat, Philippe
> Cc: Hal Rosenstock; Tziporet Koren; openib-general at openib.org
> Subject: Re: [openib-general] Performance Degradation with 
> OFED v. Voltaire
> 
> OK, it looks like the PCI config is OK.
> 
> I guess the difference must be in the Lustre NAL, since you say other
> userspace code gets comparable performance.  Is there any difference
> in the architecture of the NAL for the Voltaire stack and the standard
> Linux stack?
> 
> You may have to rely on Voltaire and/or the Lustre people to fix this,
> since they're the only ones with the complete picture about the
> Voltaire stack.
> 
>  - R.
>