Latency spikes on FreeBSD 8.2 with kernel scan function.

Pawel Tyll ptyll at
Tue Nov 22 03:08:32 CET 2011

Hi list,

Is  it  just  me,  or  is something totally broken in scan function of
kernel protocol?

# ping -i 0.01 -c 2500
PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=64 time=0.019 ms
64 bytes from icmp_seq=1149 ttl=64 time=0.018 ms
64 bytes from icmp_seq=1150 ttl=64 time=0.018 ms
64 bytes from icmp_seq=1151 ttl=64 time=176.896 ms
64 bytes from icmp_seq=1152 ttl=64 time=204.953 ms
64 bytes from icmp_seq=1153 ttl=64 time=0.027 ms
64 bytes from icmp_seq=1154 ttl=64 time=0.026 ms
64 bytes from icmp_seq=2499 ttl=64 time=0.019 ms
--- 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.


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