From: John Heffner <jheffner@xxxxxxx>
Subject: Re: [PATCH 0/9]: TCP: The Road to Super TSO
Date: Wed, 8 Jun 2005 17:40:10 -0400
> On Tuesday 07 June 2005 12:08 am, David S. Miller wrote:
> > Some folks, notable the S2IO guys, get performance degradation
> > from the Super TSO v2 patch (they get it from the first version
> > as well). It's a real pain to spot what causes such things
> > in such a huge patch... so I started splitting things up in
> > a very fine grained manner so we can catch regressions more
> > precisely.
>
> I'm curious about the details of this. Is there decreased performance
> relative to current TSO? Relative to no TSO? Sending to just one receiver
> or many, and is it receiver limited?
The receiver is limited in their tests. No current generation systems
can fill a 10gbit pipe fully, especially at 1500 byte MTU.
Performance went down, with both TSO enabled and disabled, compared to
not having the patches applied.
That's why I'm going through this entire exercise of doing things one
piece at a time.
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