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

[Paul]

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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>