[Bug 579117] Re: Wireless blocks USB-Audio, leading to dropouts

[Chris Hermansen]

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!

-- 
Wireless blocks USB-Audio, leading to dropouts
https://bugs.launchpad.net/bugs/579117
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.