Ok, so I installed latencytop and ran it. I've been looking at the display but can't see anything specifically related to wireless operation.
I started up rhythmbox and ran it, waiting for an underrun. When I got one, I waited a few seconds and then hit refresh on the latencytop display, then freeze. On the left hand side under Global I see events/1 194.3 kondemand/0 167.5 kondemand/1 102.4 jbd2/sda1-8 57.9 compiz 39.8 events/0 33.1 sundaemon 22.1 Xorg 18.1 everything else is below 10.0 ms. Looking under events/1, I see that the cause is Scheduler: waiting for CPU. Same for the two kondemand's. The jdb2/sda1-8 is doing three things: writing buffer to disk (synchronous) which takes 57.9 ms, Scheduler: waiting for cpu which is 2.1 ms, and writing a page to disk which is 0.7 ms. Well, none of that speaks to me, so I've un-frozen latencytop and now I'm watching it refresh itself every 30s. Generally under global I see that the scheduler: waiting for cpu is at the top. I just saw an underrun in the log now I'm waiting for a refresh. Under global there is: Scheduler: waiting for cpu 274.5 ms Waiting for TTY data 268.0 ms opening cdrom device 6.8 ms everything else well below 10ms. There is a waiting for event (poll) at 5.0ms that is 36.1%. Is that meaningful? The backtrace for that is poll_schedule_timeout do_poll do_sys_poll sys_poll syscall_call When I go back down into the detailed targets under Global, I can't find any big percentage used up by any one of the targets. I'm a bit stuck here, any more specific advice? Please and thanks! On Sun, 2010-05-16 at 11:25 +0000, David Henningsson wrote: > Good question. Perhaps you can verify that the wireless actually blocks > everything for a long while, by running latencytop (install the > latencytop package) and see if you get something that confirms the > suspicion? > > > ** Summary changed: > > - [USB-Audio - USB Audio CODEC ] Playback problem > + Wireless blocks USB-Audio, leading to dropouts > > ** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu) > > ** Changed in: linux (Ubuntu) > Importance: Undecided => Medium > -- Regards, Chris Hermansen ยท mailto:c.herman...@telus.net -- Wireless blocks USB-Audio, leading to dropouts https://bugs.launchpad.net/bugs/579117 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
