Fabien Thomas wrote:
To share my results:
I have done at work modification to the polling code to do SMP polling
(previously posted to this ml).
SMP polling (dynamic group of interface binded to CPU) does not
significantly improve the throughput (lock contention seems to be the
cause here).
The main advantage of polling with modern interface is not the PPS
(which is nearly the same) but the global efficiency of the system
when using multiple interfaces (which is the case for Firewall).
The best configuration we have found with FreeBSD 6.3 is to do polling
on one CPU and keep the other CPU free for other processing. In this
configuration the whole system
is more efficient than with interrupt where all the CPU are busy
processing interrupt thread.
out of curiosity: did you try polling on 4.x? i know it doesn't
"support" SMP over there, but last time i tried polling on 7.x (or was
it 6.x? i don't remember...)
i found it didn't gave any benefit, while switching the system to 4.x
showed a huge improvement.
--
bye,
P.
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