--Lee Revell <[EMAIL PROTECTED]> wrote (on Tuesday, July 12, 2005 10:24:59 -0400):
> On Mon, 2005-07-11 at 21:30 -0700, Martin J. Bligh wrote: >> Exactly what problems >> *does* it cause (in visible effect, not "timers are less granular"). >> Jittery audio/video? How much worse is it? > > Yes, exactly. Say you need to deliver a frame of audio or video every > 5ms. Ummm. that's a 200HZ refresh rate, is it not? That seems unreasonable (to a lay-person, as far as video goes). > You have a rendering thread and a display thread that communicate > via FIFOs. The main thread waits in select() for the next frame to > complete rendering or for the deadline to expire. That's next to > impossible with HZ=100, because the best you can do is the deadline > +-10ms. With HZ=1000 it's no problem. So if we have a 50HZ refresh rate, and a HZ rate of 250 or 300, it'll work fine then, right? I know that's actually some error in the timers, so it may be 2 or 3 ticks, not 1, but if we're running HZ at 5 or 6 times the frequency of video, presumably that'd still work fine? M. - 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/
