Freebsd IP Forwarding performance (question,
and some info) [7-stable, current, em, smp]
paul at gtcomm.net
Tue Jul 1 16:04:03 UTC 2008
Thanks.. I was hoping I wasn't seeing things :>
I do not like inconsistencies.. :/
Stefan Lambrev wrote:
> Greetings Paul,
>> ------OK I'm stumped now.. Rebuilt with preemption and ULE and
>> preemption again and it's not doing what it did before..
> I saw this in my configuration too :) Just leave your test running for
> longer time and you will see this strange inconsistency in action.
> In my configuration I almost always have better throughput after
> reboot, which drops latter (5-10min under flood) with 50-60kpps and
> after another 10-15min the number of correctly passed packet increase
> again. Looks like "auto tuning" of which I'm not aware :)
>> How could that be? Now about 500kpps..
>> That kind of inconsistency almost invalidates all my testing.. why
>> would it be so much different after trying a bunch of kernel options
>> and rebooting a bunch of times and then going back to the original
>> config doesn't get you what it did in the beginning..
>> I'll have to dig into this further.. never seen anything like it :)
>> Hopefully the ip_input fix will help free up a few cpu cycles.
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