Today I discovered this thread in freebsd-net list: http://thread.gmane.org/gmane.os.freebsd.stable/51991
The point why it got my attention is that it looks very similar with the situation I have ... except that my problem is with audio. Probably there is problem with network as well, I just haven't checked. But the audio problem is noticeable. It looks exactly the same as described in the thread ... It's OK for some time after boot, but often after heavy disc activity (rsync, hg pull, even scp sometimes) short (but very noticeable) glitches will appear in audio and they repeat after every ~30 sec. The same glitch in audio happens if I manually run sync command (it isn't there after boot either). I haven't discovered any way to get rid of these regular glitches in audio except boot. If it matters, I'm using snd_hda(4). Anyone else is seeing it? Ideas how to debug it? Ideas to fix or at least workaround? It's damn annoying with workstation at work where the only way to survive is music in closed-back headphones ;). -- Hasso
