Sound skipping problems

[Sebastiaan van Erk]

Hi,

Thank you for your reply!

I tried the patch, but unfortunately when I reboot with the patch (which 
cleanly applies and compiles), audio stops working. The device (pcm0) is 
still there, the mixer is set ok, and everything looks normal, just no 
sound comes out of the speakers.

I have no idea why the patch doesn't work, but if you want any more 
information I'll be happy to supply it to you. The sound skipping seems 
at least fixed by just increasing the buffer size, but don't know how 
reliable this workaround is compared to a structural workaround.

Furthermore I don't know if this message is relevant, but it seems the 
snd_8233 driver doesn't like my audio codec very much:

pcm0: <VIA VT8237> port 0xec00-0xecff irq 22 at device 17.5 on pci0
pcm0: [GIANT-LOCKED]
pcm0: <Unknown AC97 Codec (id = 0x56494170)>

Greetings,
Sebastiaan van Erk


Ariff Abdullah wrote:
> On Sun, 06 Nov 2005 12:39:02 +0100
> Sebastiaan van Erk <sebster at sebster.com> wrote:
> 
>>Hi,
>>
>>I have major sound skipping problems on FreeBSD 6.0. I checked the 
>>mailing list archives and found a related thread:
>>
>>http://lists.freebsd.org/pipermail/freebsd-current/2005-June/051103.html
>>
>>To quote Jeff Roberson:
>>
>> > I have a patch that should greatly improve the sound skipping
>> > problems people have under heavy io load.  Several people sent me
>> > traces that showed the buf daemon running for hundreds of
>> > milliseconds with Giant held, which can hold up the pcm code. 
>> > The patch is available at:
>> >
>> > http://www.chesapeake.net/~jroberson/flushbuf.diff
>>
>>The problems are definately correlated to io load, however I can't
>>say  that I have HEAVY io loads. A simple: # sync;sync;sync; will
>>already  cause the sound to skip.
>>
>>I have DMA enabled on all drives, and it seems the above patch is 
>>already merged into FreeBSD 6.0-STABLE. This leaves me at a loss,
>>and I  don't know what else to try...
>>
>>Does anybody have any ideas of what I could do to solve this
>>problem?
>>
>>
> 
> Recompile your kernel with "options PREEMPTION", and apply this patch:
> 
> http://people.freebsd.org/~ariff/snd_RELENG_6_0_20051030_058.diff
> 
> 
> --
> Ariff Abdullah
> MyBSD
> 
> http://www.MyBSD.org.my (IPv6/IPv4)
> http://staff.MyBSD.org.my (IPv6/IPv4)
> http://tomoyo.MyBSD.org.my (IPv6/IPv4)
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