[ofa-general] RE: [Bug 506] IPoIB IPv4 multicast throughput is poor

[Scott Weitzenkamp (sweitzen)]

Michael or Roland, could you please try iperf with UDP vs multicast, so
I'm not the middleman here?

Scott

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst at dev.mellanox.co.il] 
> Sent: Wednesday, April 11, 2007 9:17 PM
> To: bugmail at lists.openfabrics.org; Roland Dreier; Scott 
> Weitzenkamp (sweitzen); general at lists.openfabrics.org
> Subject: Re: [Bug 506] IPoIB IPv4 multicast throughput is poor
> 
> > Yes, get a stready stream of these on sender.
> > 
> > ib0: TX ring full, stopping kernel net queue
> 
> Aha. (As a note, it's always useful to set debug level when
> you experience problems).
> 
> > Why am I getting low throughput of IP multicast vs IPoIB UD 
> UDP unicast?
> 
> It's something in the hardware - it's not handing out
> completions fast enough, . Try increasing send queue size
> through IPoIB module parameter.
> 
> 
> BTW, Roland, why aren't we using txqueuelen ifconfig/ethtool 
> options here?
> 
> -- 
> MST
>