At Fri, 5 Oct 2001 17:29:48 +0200 (CEST), Erik Inge Bolsų wrote: > > 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>
Right.. I've used the word really confusing. The latency is of course 2 (up to 3) msec. Takashi _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
