On Tue, Nov 22, 2011 at 09:43:52AM +0100, Pawel Tyll wrote:
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 ? No no. And there's almost no traffic. There's one IBGP peer, this machine isn't in production yet. It was for a moment, but had to be pulled because of this. I'm 100% certain this has something to do with 'scan' facility of 'kernel' protocol.
You can verify that by disabling 'kernel' protocol. On BSD, kernel scan is implemented by requesting a big buffer and copying several tens of MB of route data from kernel to BIRD. I am not an expert on BSD, but perhaps there may be some kernel problem on some BSD version? Another possible explanation is that kernel scan for some reason generates a lot of log messages that strains the disk/systen, but i would doubt that. -- Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: santiago@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."