On Thu, Sep 3, 2009 at 3:05 PM, Clemens Ladischclemens@ladisch.de wrote:
The interrupts of other drivers are based on the PCM stream clock, but the snd-dummy driver has to emulate interrupts using the system timer, so it is the only one affected by timer-related changes.
ok, got it
The driver relies on the kernel's system timer. It might be possible to rewrite it to use high-resolution timers, if the CentOS kernels supports it.
I'll have a look into it
It would be easier to try to change the constraints of the sound card that snd-dummy tries to emulate; set USE_PERIODS_MIN to four or so, and increase period_bytes_min to some value that is at least as large as the numer of bytes per timer tick (with 2 channels and 16 bits at 48 kHz, there are 192000 bytes per second).
I'll have a look into this and then I'll report here.
Clemens, thanks for your help!
-giovanni