On Sun, 2007-04-08 at 23:39 +0200, Karl Hammar wrote: > James Stone <jamesmstone@xxxxxxxxx>: > > On Sun, Apr 08, 2007 at 01:38:34PM +0200, Karl Hammar wrote: > > > Andrew Burgess <aab@xxxxxxxxxxx>: > > > > Paul Davis wrote: > > > > >> What could cause clicks without xruns? I'm baffled. > > > > >PCI bus hogging, for one thing. consider running a script like this > > > ... > > > > setpci -s $p latency_timer=ff > ... > > I am slightly confused. Is it necessary to increase the latency > > timer for a pci sound card? This seems slightly > > counter-intuitive. Wouldn't this reduce the performance of the > > sound system through that card? > > Performance and latency is different things. In audio we accept all > latencies below 30ms (I think), less than that does not gain anything. > > But we can gain bandwith by using longer bursts, thus a higher latency > (within bounds) gives us greater performance. no, this is not really accurate. the PCI latency timer determines how long a device may own the PCI bus for, it has nothing to do with audio latency. therefore, if your system allowed the video interface to hog the PCI bus for a relatively long time, but limited the audio interface to only short periods of bus ownership, then audio performance will suffer. the script i posted first resets *all* devices to an acceptable middle-of-the-road timer setting, then specifically allows the audio interfaces to own the bus for even longer. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
