Re: e1000 performance hack for ppc64 (Power4)

From: Lincoln Dale (
Date: Sat Jun 14 2003 - 00:52:35 EST

At 10:41 PM 13/06/2003 -0700, David S. Miller wrote:
> From: Lincoln Dale <>
> Date: Sat, 14 Jun 2003 11:52:53 +1000
> unless i misunderstand the problem, you can certainly pad the TCP
> options with NOPs ...
>You may not mangle packet if it is not your's alone.
>And every TCP packet is shared with TCP retransmit
>queue and therefore would need to be copied before
>being mangled.

ok, so lets take this a step further.

can we have the TCP retransmit side take a performance hit if it needs to
realign buffers?

once again, for a "high performance app" requiring gigabit-type speeds, its
probably fair to say that this is mostly in the realm of applications on a
LAN rather than across a WAN or internet.
on a switched LAN, i'd expect TCP retransmissions to be far fewer ...



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