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alsa: disable timer-based scheduling inside a VM

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In virtual machines sound card clocks and OS scheduling tend to become
unreliable, adding various 'uneven' latencies. The adaptive algorithm
that handles drop-outs does not handle it this well: in contrast to
drop-outs on real machines that are evenly distributed, small and can
easily be encountered via the adpative algorithms, drop-outs in VMs tend
to happen abruptly, and massively, which is not easy to counter.

This patch simply disables timer based scheduling in VMs reverting to
classic IO based scheduling. This should help make PA perform better in
VMs.

https://bugzilla.redhat.com/show_bug.cgi?id=532775
This commit is contained in:
Lennart Poettering 2009-11-05 03:23:08 +01:00
parent c079ceeba0
commit 53b046d5c9
4 changed files with 28 additions and 8 deletions
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5
src/modules/alsa/alsa-sink.c
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@ -1698,10 +1698,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
goto fail;
}
if (use_tsched && !pa_rtclock_hrtimer()) {
pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
use_tsched = FALSE;
}
use_tsched = pa_alsa_may_tsched(use_tsched);
u = pa_xnew0(struct userdata, 1);
u->core = m->core;