Re: bad TSO performance in 2.6.9-rc2-BK

[Andi Kleen <ak@xxxxxxx>]

On Mon, Sep 27, 2004 at 04:37:51PM -0700, David S. Miller wrote:
> On Tue, 28 Sep 2004 01:25:55 +0200
> Andi Kleen <ak@xxxxxxx> wrote:
> 
> > Unfortunately not - with the patch applied I still get 27MB/s
> 
> And without TSO you get?  How exactly are you running netperf

~66MB/s

> and are you going through a switch?  I want to reproduce your

Yes, a buffalo gigabit switch.

> test case exactly here although using tg3 instead of e1000 :)

I'm running the test from a e1000 through the switch to a tg3
(tg3 with an older kernel).

I also tested it now from a tg3 machine to the other tg3 machine.
That's 48MB/s (with your patch). The tg3 machine is slower though
because the tg3 sits in a 33Mhz PCI slot, no CSA etc. 
From the tg3 machine with your patch the numbers are the same
both with TSO on and off.

Looks like the e1000 is too fast...

-Andi