Re: packet re-ordering on SMP machines.

From: David S. Miller (davem@redhat.com)
Date: Sun Aug 25 2002 - 17:49:24 EST


   From: Alan Cox <alan@lxorguk.ukuu.org.uk>
   Date: 25 Aug 2002 15:41:13 +0100

> 3) If answer to 2 is no, would you all be interested in a patch that
> did allow strict ordering (if indeed I can figure out how to write one)?
   
   You should never need it. Ethernet, hubs, switches, routers, internet
   backbones etc will all cause packet re-ordering. You should also expect
   the percentage of re-ordered frames on the net to rise and rise.
   
But to be honest, NAPI was meant to dramatically reduce the "SMP
specific" causes of packet reordering. When a driver does use NAPI,
the reordering due to SMP goes way down.
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