> -----Original Message-----
> From: James Morris [mailto:jmorris@xxxxxxxxxx]
> Sent: Wednesday, September 15, 2004 4:16 PM
> To: John Heffner
> Cc: Netdev; leonid.grossman@xxxxxxxx
> Subject: Re: The ultimate TOE design
> On Wed, 15 Sep 2004, John Heffner wrote:
> > The other (much nicer) solution to case (b) is to just USE
> A BIGGER MTU.
> > 1500 bytes is ridiculously small. Even with a 9k MTU, the
> benefits of
> > TOE or TSO are nearly vanishing.
> Do you have any figures on (large) MTU size vs performance on
> a current commidity system?
It's very system-dependent. Say on 2-way Xeon our card goes from ~2Gbps to
~6Gbps, on 64-bit systems the delta is obviously less.
For 9k MTU, the delta goes down of course but it is still ~10% on 2.6
systems - say on 2-way Opterons we go from 7Gbps to 7.6Gbps.
> - James
> James Morris