? 2012?3?30? ??12:48?Arun Raghavan <arun.raghavan at collabora.co.uk>??? > Hi, > > On Thu, 2012-03-29 at 21:31 +0800, Deng Zhenrong wrote: > > According to the description below: > > > > http://lkml.org/lkml/2009/7/17/258 > > > > There are two benefits: > > a) it doesn't need to access the hardware. > > b) avoid the syscall by using vdso clock_gettime(). > > > > The cons is the CLOCK_MONOTONIC_COARSE returns the time at the last > > tick. > > As Pierre mentions, we actually _want_ high resolution time sources for > our uses. We use these timers to predict when the audio buffer will be > nearing being empty so that we can wake up and fill the buffer again. > Having a coarse timer for this purpose would mean that we can be woken > up late, causing the device to underrun and users to hear glitches. > > Maybe I'm testing this patch in an idle state, so there's no underrun seen, I'll take that into account. Thanks for your clarification here. It helps me understand pulseaudio better. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20120331/5ebfe277/attachment.htm>
