[snd_hda] Choppiness under high cpu - STABLE

[Ariff Abdullah]

On Mon, 4 Jun 2007 23:07:54 +1000
Norberto Meijome <freebsd at meijome.net> wrote:
> On Mon, 4 Jun 2007 16:44:20 +0800
> Ariff Abdullah <ariff at FreeBSD.org> wrote:
> 
> > > 
> > > Have you tried with 4096 ? Note: this should go into
> > > hint.pcm.0.buffersize kernel hint, not sysctl variable. After
> > > setting it (using kenv), you must reload the sound module or
> > > reboot if it going through /boot/device.hints. The sysctl
> > > buffersize is there purely as indicator.
> > >   
> > 
> > I forgot to mention that enabling/disabling vchans are matters as
> > well, so please take note on that.
> 
> ok - back to the klds from the src tree.
> 
> [betom at ayiin] [Mon Jun  4 22:30:37 2007]
> /usr/home/betom
> $ sysctl -a | grep snd
> hw.snd.report_soft_formats: 1
> hw.snd.targetirqrate: 32
> hw.snd.verbose: 1
> hw.snd.maxautovchans: 4
> hw.snd.unit: 0
> hw.snd.pcm0.buffersize: 4096
> hw.snd.pcm0.vchans: 1
> 
> [betom at ayiin] [Mon Jun  4 22:30:43 2007]
> /usr/home/betom
> $ kenv | grep buffer
> hint.pcm.0.buffersize="4096"
> 
> I tried 4096, 8192, 16384. In all cases, stress -m 1  brings up
> immediate choppiness/chirping. :(
> 
> 
> I'm now back to the binary blob... I repeated the tests (with
> default buffersize of 16K, and 8 vchans as before), and it seems
> that with stress -m 2 there is an ever so slight chirpiness, more
> noticeable with -m 3 , definitely there @ -m 4 - but definitely
> better than the other one.
> 
> thanks!!
> B
> 

All I can say is that the code in -current are much.. much improved
compared to anything we have before or in releng6. There's no easy way
to MFC all the improvements due to radical changes, but at least, you
still have the option to apply the patch or use my binary modules.

As usuall: http://people.freebsd.org/~ariff/

The current theme is: Giant Eradication :)


--
Ariff Abdullah
FreeBSD

... Recording in stereo is obviously too advanced
    and confusing for us idiot ***** users :P ........
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