Freebsd IP Forwarding performance (question, and some info) [7-stable, current, em, smp]

Peter Jeremy peterjeremy at
Mon Jul 7 22:13:03 UTC 2008

On 2008-Jul-07 13:25:13 -0700, Julian Elischer <julian at> wrote:
>what you need is a speculative prefetch where you an tell teh 
>processor "We will probably need the following address so start 
>getting it while we go do other stuff".

This looks like the PREFETCH instructions that exist in at least amd64
and SPARC.  Unfortunately, their optimal use is very implementation-
dependent and the AMD documentation suggests that incorrect use can
degrade performance.

Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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