Latency spikes on FreeBSD 8.2 with kernel scan function.

[Alexander V. Chernikov]

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Pawel Tyll wrote:
> Hi,
> 
>> 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
disappers) ?
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' :)
> 
> Thanks,
> 
> Pawel.
> 
> 
> 

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