On Fri, 5 Oct 2001, Takashi Iwai wrote: >At Fri, 05 Oct 2001 10:24:26 -0400, >Paul Davis wrote: >> >A good news: after several tries and hacks, I got 1msec latency. >> >> from what card? or is this using the h/w pointer location directly, >> and not relying on interrupts ? i don't know any cards that can >> provide 1msec output latency by using interrupts ... > >SB Live with 2 x 256 bytes period. The test program uses simple loop >of snd_pcm_writei(). The pcm interface is hw, of course. >I tried two patched kernels, LL patch and preemption patch. >Both results are shown at > http://www.alsa-project.org/~iwai/latency-results/rf-ll2-alsa/2x256.html >and > http://www.alsa-project.org/~iwai/latency-results/rf-pe2-alsa/2x256.html >respectively.
<nitpick> Now what is our definition of latency, exactly? 256 byte periods = 1.45ms between interrupts, according to simple calculations - so we're not at the sub-1ms level yet, at least :)= </nitpick> -- Erik I. Bolsų | email: <knan at mo.himolde.no> The UNIX philosophy basically involves giving you enough rope to hang yourself. And then a couple of feet more, just to be sure. _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
