11 Feb
2010
11 Feb
'10
9:27 a.m.
On Thu, 11 Feb 2010, Clemens Ladisch wrote:
Do you mean that PA only wake up once when configure sound card to use two periods per buffer ?
When using two periods per buffer, ALSA tries to wake up PA two times. However, PA ignores the sound card's interrupts and is woken up by its own timer.
PA can drive the wake-ups using avail_min sw parameter. If this value is high enough, no userspace wake up is called, only interrupt is processed and internal ring buffer pointers in the driver are updated.
Jaroslav
----- Jaroslav Kysela perex@perex.cz Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc.