Giovanni Maruzzelli wrote:
Yes, CONFIG_PREEMPT* are probably different between the various kernels, and also the compiled kernel is tickless.
But, this is a problem only with snd-dummy.
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.
What I would like, in the interest of users, is snd-dummy to be modified in a way that makes it working on the regular CentOS-RHEL kernels,
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.
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).
HTH Clemens