Hello,
I've got a HP ML-350 machine, dual Xeon 3Ghz.
The system is running:
FreeBSD 6.1-RELEASE-p7
and has the following netcards and traffic:
2 x fxp cards
2 x em cards
each fxp card does about 80mbits traffic in/out
each em card does about 200 mbits traffic in/out (packets are routed
from em0 to em1 --> cisco 3750 access layer equipment)
What I've noticed recently is that my CPU usage stays at about 80% when
systat -ip 10 shows an average of 150-180 kpps being forwarded through
this box.
With SMP enabled I had 85-90% CPU interrupt load so I disabled that.
Also I disabled the ipfw queueing code I had on one of the fxp cards
(dynamic queueing with 6000 hash buckets - I have quite that many ip
addresses and wanted each to hash to a different queue).
The load dropped to 60%.
Also I have polling disabled on the em cards (polling was causing packet
drops with different Hz values; didn't try the idle poll as that used to
crash my machine after a day or so of working a couple of months ago)
and fast_forwarding enabled.
On the fxp cards I tried with both polling enabled/disabled.
I wanted to ask if there is any other tweaking possible to improve the
routing performance.
Thanks,
Mihai
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