Re: bad TSO performance in 2.6.9-rc2-BK

["David S. Miller" <davem@xxxxxxxxxxxxx>]

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
and are you going through a switch?  I want to reproduce your
test case exactly here although using tg3 instead of e1000 :)

> Looking at the tcpdump the ack clock goes completely out of sync,
> the ratio is 4 packets per ack. The sender seems to send packets
> faster than the target can ack them. It eventually stops for a 
> short time until it gets the ack

Hmmm, thanks for the trace.