[alsa-devel] [RFC] disabling ALSA period interrupts

[Raymond Yau]

2010/5/12 Mark Brown <broonie at opensource.wolfsonmicro.com>

> On Wed, May 12, 2010 at 08:50:42AM -0500, pl bossart wrote:
>
> > This might be almost equivalent to the timer approach in terms of # of
> > wakeups, however the timer can be reprogrammed on-the-fly whereas
> > periods can only be changed by closing and reopening the device. You
> > can also adjust the timer shall underflows occur. And the timer slack
> > lets the kernel group events. Not to mention that you will need
>
> The timer is also useful for allowing PulseAudio to dynamically adjust
> the period size as the runtime situation changes - if you're running
> high latency streams and have a low latency application start up then
> PulseAudio can just change the timer to get more frequent events.
>

how low latency can PA provide ?

any tool to measure the latency ?

seem alsa-lib/test/latency did not work on pulse device