Subject: Re: Info: NAPI performance at "low" loads

From: Andrew Morton <[email-masked]>
Date: Tue, 17 Sep 2002 19:16:25 -0700

"David S. Miller" wrote:
> 
>    From: jamal <[email-masked]>
>    Date: Tue, 17 Sep 2002 20:57:58 -0400 (EDT)
> 
>    I am not so sure with that 6% difference there is no other bug lurking
>    there; 6% seems too large for an extra two PCI transactions per packet.
> 
> {in,out}{b,w,l}() operations have a fixed timing, therefore his
> results doesn't sound that far off.
> 
> It is also one of the reasons I suspect Andrew saw such bad results
> with 3c59x, but probably that is not the only reason.

They weren't "very bad", iirc.  Maybe a 5% increase in CPU load.

It was all a long time ago.  Will retest if someone sends URLs.