Performance hit in audio playback in Solaris 10

Hi,
I've noticed while trying out the Solaris 10 beta 72
that the audio playback quality took a major hit
since Solaris 9. I was hoping that this would go
away in the Solaris 10 release, but it's not the
case.
If I try to play an .mp3 file with mpg123 or even
audioplay an .au file, there are regular clicks in
the playback, audible about twice per second.
Booting into Solaris 9, the audio playback is
s perfect.
My intuition tells me that the integration of DTrace
into the kernel is the culprit, but of course, I have
no proof. Can anyone think of a way to test this
theory?You can be assured that DTrace is not the culprit. When DTrace is not running ("pgrep dtrace" to be sure), there is no effect on system performance.
Maybe DTrace can be
used to figure out what's going on?DTrace could certainly be used, but some basic facts would be helpful. As Juergen asked, which audio driver is this and on what machine? And how idle is the machine when audio playback is running? Is the machine power managed?
- Bryan
Bryan Cantrill, Solaris Kernel Development. http://blogs.sun.com/bmc

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