Commit b4350dee authored by Hans de Goede's avatar Hans de Goede Committed by Gerd Hoffmann
Browse files

audio: honor QEMU_AUDIO_TIMER_PERIOD instead of waking up every *nano* second 



Now that we no longer have MIN_REARM_TIMER_NS a bug in the audio subsys has
clearly shown it self by trying to make a timer fire every nano second.

Note we have a similar problem in 1.6, 1.5 and older but there
MIN_REARM_TIMER_NS limits the wakeups caused by audio being active to
4000 times / second. This still causes a host cpu load of 50 % for simply
playing audio, where as with this patch git master is at 13%, so we should
backport this to 1.5 and 1.6 too.

Note this will not apply to 1.5 and 1.6 as is.

Cc: qemu-stable@nongnu.org
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent fc8ead74

audio/audio.c

+2 −1
Original line number Diff line number Diff line
@@ -1124,7 +1124,8 @@ static int audio_is_timer_needed (void) 
static void audio_reset_timer (AudioState *s)

{

    if (audio_is_timer_needed ()) {

        timer_mod (s->ts, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1);

        timer_mod (s->ts,

            qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + conf.period.ticks);

    }

    else {

        timer_del (s->ts);