Comment 25 for bug 579117

Ok so fresh hard drive fresh 9.10 install with latencytop running alongside Bob Marley.

Here's what I see.

This is the original disk that came with the laptop, a 100gb 4400 rpm drive; it's pretty slow.

I see two causes with higher latency: fsync() on a file, and scheduler: waiting for cpu

fsync() on a file just reported 67.6ms, but I have seen it over 1 second.
Scheduler: waiting for cpu just reported 34.1ms but I have seen it bulge to 300+ when one of those darn ath5k phy0: noise floor calibration timeout (2412MHz) messages come up.

I have heard no stuttering. There are no "underrun" messages in syslog or messages, mind you I haven't turned on the verbose mode on the pulseaudio daemon.

ok there was another ath5k message and a 273.1ms Scheduler: waiting for CPU.

now scheduler is 38.9ms.

now scheduler is 46.6ms

now scheduler is 44.2ms

So I am concluding that the latencies are lower except when the ath5k noise floor thing happens. And generally I'm not hearing / seeing evidence of underruns.

David, it's convenient for me to do other testing in both versions of Ubuntu, so if you have any other ideas, please let me know.

Thanks!