Latency spikes on FreeBSD 8.2 with kernel scan function.
Alexander V. Chernikov
melifaro at ipfw.ru
Tue Nov 22 09:27:56 CET 2011
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Pawel Tyll wrote:
>> bird has nothing to do with kernel packet forwarding. It is control
>> plane software.
>> Do you have some kind of shaping (dummynet, altq) configured?
> I do have dummynet configured, but like I said - every 20 seconds
> network freezes for about 0.5s. Guess what happens every 20 seconds...
> You got it! Protocol "kernel" scans the kernel routes. Also, after
> /usr/local/etc/rc.d/bird stop, problem is gone. What could be causing
bird is stopped, traffic forwarding is stopped (since dynamic routes
Perhaps your configuration shapes ALL (e.g. network AND local) traffic
withing single queue? If so, when queue is full with network traffic
even local traffic is delayed ?
> this? I can't believe scanning kernel routes is supposed to be this
> resource intensive?
No. It is not any kind of 'intensive' :)
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