Re: Route cache performance under stress

From: David S. Miller (davem@redhat.com)
Date: Thu May 22 2003 - 19:59:38 EST


   From: Simon Kirby <sim@netnation.com>
   Date: Thu, 22 May 2003 04:44:38 -0700
   
   There's no APIC on this test box, so it's using the XT-PIC.
   Production has an APIC, so I assume the overhead would be less
   there.

It is absolutely critical for routing throughput. XT-PIC overhead
severely limits your maximum packets/second switching rate.

Another thing to watch out for are drivers still using PIO to
access device registers (3c59x comes to mind).
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