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.
The hardware is:
CPU Athlon 600MHz
Memory 256MB
HDD IDE UDMA66
Graphic Viper770 (Nvidia, XF86-4.1.0 driver)
Well, I was surprised, too... ;)
It becomes better and better. Exciting.
Takashi
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