On Thu, 2007-04-26 at 02:13 -0700, Mike Mattie wrote: > Hello, > > I am still struggling to track down problems with audio playback. I get > intermittent: > > Apr 26 02:01:40 reforged [13230.947879] cannot submit sync urb (err = -45) > > I have tackled the scheduler issues to where I really don't think the > driver is being starved at all. I am running audacious like so: > > schedtool -R -p 50 -n 1 -e audacious > > At this point the strongest correlation I can get is that starting > programs seems to trigger the stutter. I have suspected IO for > some time. > > My system image , / & /usr are on a libata (VIA PATA) driver. > I have disabled the write-cache , but I also have noatime set > on mount, for /usr > > My big suspicion is that one of my drivers, likely IO is > disabling interrupts for too long. > > I have looked but not found a tool for measuring the longest > period interrupts are disabled and pointing the finger at > the culprit, could anyone on this list recommend tools that > might help me pinpoint what is going on ? > > I would also be delighted for any sort of recommended latency > testing tools. > > pin-pointing this is going to be a "learning experience" but > every time I think I am about to have a bonding moment with > the kernel audio skips; I am highly motivated.
The -rt kernel contains a full latency tracer. http://people.redhat.com/mingo/realtime-preempt/ Some hardware just isn't up to the job though... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
