[pulseaudio-discuss] PA terminated in stress test

Zhang, Xing Z xing.z.zhang at intel.com
Sun Mar 1 21:14:21 PST 2009

Thanks your info!
Our driver guy is taking care of this issue.

Zhang Xin(Wing)
Intel(SSG/OTC) ShangHai China 

>-----Original Message-----
>From: pulseaudio-discuss-bounces at mail.0pointer.de [mailto:pulseaudio-
>discuss-bounces at mail.0pointer.de] On Behalf Of Lennart Poettering
>Sent: 2009年2月28日 15:58
>To: pulseaudio-discuss at mail.0pointer.de
>Subject: Re: [pulseaudio-discuss] PA terminated in stress test
>On Fri, 27.02.09 16:09, Zhang, Xing Z (xing.z.zhang at intel.com) wrote:
>> Hi Lennart:
>> 	We met an issue when do a stress test on PA.
>> 	We play ~10 streams and do pause/resume on them at will. The PA
>terminated after 2 ~ 5 minutes.
>> Below are logs:
>> E: alsa-sink.c: ALSA woke us up to write new data to the device, but
>there was actually nothing to write! Most likely this is an ALSA driver bug.
>Please report this issue to the ALSA developers. We were woken up with
>POLLOUT set -- however a subsequent snd_pcm_avail_update() returned 0.
>> W: ratelimit.c: 32 events suppressed
>> N: alsa-sink.c: Increasing wakeup watermark to 40.00 ms
>> N: alsa-sink.c: Increasing wakeup watermark to 80.00 ms
>> Soft CPU time limit exhausted, terminating.
>> E: cpulimit.c: Received request to terminate due to CPU overload
>> It seems a configuration issue. Could you give some comments? thanks
>Your sound driver is broken (as noted in the log messages above).
>Some audio drivers do not implement snd_pcm_delay() and
>snd_pcm_avail() correctly. e.g. intel-hda on some chips sometimes
>overflows in snd_pcm_avail(). Since this call is used to determine how
>much data PA must generate and write to the audio device an overflown
>value usually means that PA will eat considerable CPU time to fullfill
>humungous requests by the sound card. PA's CPU load limiter then
>activates itself and terminates PA.
>Also, as noted in log message the sound driver of yours very often
>sets POLLOUT although there is nothing to write. That as well is a bug
>in the sound driver. It causes PA to spin in its IO loop and results
>on unnecessarily high CPU load.
>Please make sure that your sound driver is fixed.
>Also note the recent thread on alsa-devel about this.
>Lennart Poettering                        Red Hat, Inc.
>lennart [at] poettering [dot] net         ICQ# 11060553
>http://0pointer.net/lennart/           GnuPG 0x1A015CC4
>pulseaudio-discuss mailing list
>pulseaudio-discuss at mail.0pointer.de

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