-----Original Message-----
From: James Morris [mailto:jmorris@redhat.com] 
Sent: Wednesday, September 15, 2004 4:16 PM
To: John Heffner
Cc: Netdev; leonid.grossman@s2io.com
Subject: Re: The ultimate TOE design

On Wed, 15 Sep 2004, John Heffner wrote:

quoted

The other (much nicer) solution to case (b) is to just USE 

A BIGGER MTU.

quoted

1500 bytes is ridiculously small.  Even with a 9k MTU, the 

benefits of 

quoted

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.

Leonid

- James
--
James Morris
[off-list ref]