Re: Q: Periodsize for capture, SBLive

[nobody@nowhere.invalid (Unknown)]

On Mon, Oct 18, 2004 at 09:42:11AM -0400, Paul Davis wrote:
> >I open the sound card (a SoundBlaster Live) for capture, and
> >request a period size (using set_period_size_near()) of 8 frames,
> >but what I get is a period size of 384 frames.
> 
> the SBlive can't go below 64 at best. 

OK.  Any idea why I get 384?


> 8 is about the minimum anyone has ever used with any device, and that 
> requires a fully patched 2.6 kernel with ingo's latest patches.

That touches on another thing I have been wondering about.  How is the
status of 2.6 with respect to latency?  (I have googled, and searched 
the archives, without finding any definitive answer.  Most of what I have
found relates to 2.4.)

* Is it preferable to patch a 2.6 kernel to achieve low latency?

* Are these the patches you are talking about:
http://people.redhat.com/mingo/voluntary-preempt/ ?

(All I have found before have been 2.4-stuff, like 
e.g. http://people.redhat.com/mingo/lowlatency-patches/.)

* If you (or others) could give a recommandation for a good card for low 
  latency work, that would also be appreciated.


Thanks for your help!
Asbjørn - ALSA newbie, but learning

-- 
Asbjørn Sæbø, post.doc.
Centre for Quantifiable Quality of Service in Communication Systems
Norwegian university of Science and Technology
http://www.q2s.ntnu.no




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