Re: bad TSO performance in 2.6.9-rc2-BK

[Nivedita Singhvi <niv@xxxxxxxxxx>]

Andi Kleen wrote:

> With tso off i get the same performance as on 2.6.5.
>
> I must add that this is a CSA e1000 (directly integrated into
> the chipset and doesn't use PCI) and TSO doesn't seem to be 
> bring any advantage. On 2.6.5 the performance is the same
> with both TSO on or off.
Andi, was that with a netperf TCP stream test? I
would not have thought there would be no difference
prior to the changes DaveM made recently (now we
obey congestion window). We certainly got quite a bit
of a difference running SPECWeb etc, but that was on
the e1000s.

Nivedita