> -----Original Message-----
> From: netdev-bounce@xxxxxxxxxxx
> [mailto:netdev-bounce@xxxxxxxxxxx] On Behalf Of David S. Miller
> Sent: Wednesday, June 08, 2005 2:49 PM
> To: jheffner@xxxxxxx
> Cc: netdev@xxxxxxxxxxx; herbert@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH 0/9]: TCP: The Road to Super TSO
>
> 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.
With jumbo frames, a single receiver can handle 10GbE line rate.
With 1500 mtu, a single receiver becomes a bottleneck. I will forward the
numbers later today.
>
> 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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