Re: sound issues in -CURRENT

From: Eirik Oeverby <ltning_at_anduin.net>
Date: Tue, 23 Mar 2004 12:13:35 +0100
Hoi,

I have all debugging and witness stuff disabled, though I am using 
SCHED_ULE. Apart from that, the problem seems to be somewhat less 
evident when playing from the network (no playback-related disk i/o), 
but it only reduces the problem - it does not eliminate it.

As I have stated earlier, the problem gets worse over time. After a 
clean reboot (even though all the apps I use are started and running), 
the problem shows up once every few minutes. Now, after a couple of days 
uptime, it happens a few times per minute - enough to annoy me ever so 
slightly when trying to tap the rhytm with my foot ;)

My HDD is running in ATA-100 mode (no PIO) and is reasonably fast. 
FreeBSD 4.9 works perfectly on the same machine, with all the same software.

/Eirik

Pav Lucistnik wrote:
> V út, 23. 03. 2004 v 09:26, Sřren Schmidt píše:
> 
> 
>>>Heavy disk I/O seems to be a trigger for the problem. I always hear the
>>>screwups, but i.e. when building mozilla or openoffice (during the
>>>extract phase with heavy I/O), sound almost slows down to a complete
>>>stop, stutters and hicks and cracks all the time - to a point where the
>>>music is almost impossible to even identify anymore.
> 
> 
>>I think you are suffering from the high interrupt latency in -current,
>>this combined with a soundcard with a small buffer would easily lead to 
>>your problems. A slow disk or PIO mode could also be troublesome in some 
>>cases. You do have witness etc turned off right ?
> 
> 
> I hear this too, on both my cards (Soundblaster 128 and onboard AC97
> codec). I have all possible debugging turned off. Heavy disc activity
> like untarring triggers the symptoms, which sounds like buffer underruns
> on the soundcard. Almost sounds like a new ATA stack is really effective
> (leaving little CPU cycles for feeding data to soundcard).
> 
Received on Tue Mar 23 2004 - 02:11:34 UTC

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