Re: e1000 performance hack for ppc64 (Power4)

From: David S. Miller (
Date: Fri Jun 13 2003 - 18:52:50 EST

   From: "Feldman, Scott" <>
   Date: Fri, 13 Jun 2003 16:52:18 -0700

> > Why not instead find out if it's possible to have the e1000
> > fetch the entire cache line where the first byte of the
> > packet resides? Even ancient designes like SunHME do that.
> Rusty and I were wondering why the e1000 didnt do that exact thing.
> Scott: is it possible to enable such a thing?
   I thought the answer was no, so I double checked with a couple of
   hardware guys, and the answer is still no.


So Anton, when the PCI controller gets a set of sub-cacheline word
reads from the device, it reads the value from memory once for every
one of those words? ROFL, if so... I can't believe they wouldn't
put caches on the PCI controller for this, at least a one-behind that
snoops the bus :(
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