Latency spikes on FreeBSD 8.2 with kernel scan function.

[Alexander V. Chernikov]

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Pawel Tyll wrote:
> Hi list,
> 
> Is  it  just  me,  or  is something totally broken in scan function of
> kernel protocol?

bird has nothing to do with kernel packet forwarding. It is control
plane software.
> 
> # ping -i 0.01 -c 2500 127.0.0.1
> PING 127.0.0.1 (127.0.0.1): 56 data bytes
> 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.019 ms
> (...)
> 64 bytes from 127.0.0.1: icmp_seq=1149 ttl=64 time=0.018 ms
> 64 bytes from 127.0.0.1: icmp_seq=1150 ttl=64 time=0.018 ms
> 64 bytes from 127.0.0.1: icmp_seq=1151 ttl=64 time=176.896 ms
> 64 bytes from 127.0.0.1: icmp_seq=1152 ttl=64 time=204.953 ms
Do you have some kind of shaping (dummynet, altq) configured?

> 64 bytes from 127.0.0.1: icmp_seq=1153 ttl=64 time=0.027 ms
> 64 bytes from 127.0.0.1: icmp_seq=1154 ttl=64 time=0.026 ms
> (...)
> 64 bytes from 127.0.0.1: icmp_seq=2499 ttl=64 time=0.019 ms
> --- 127.0.0.1 ping statistics ---
> 2500 packets transmitted, 2500 packets received, 0.0% packet loss
> round-trip min/avg/max/stddev = 0.007/0.187/204.953/5.495 ms
> 
> This generates quite a lot of funny things, among them being SIP
> breakage, freezes in games, hair-pulling in my person - whole network
> freezes for the scan-time.
> 
> Does this happen only on my system?
> 
> Bird 1.3.4+FIB, 8-STABLE current as of 2 hours ago.
> 
> Pawel.
> 
> 
> 

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