[PD] pd latency on puredyne 9.10 with Nvidia HDA

[ailo]

If the device is not sharing irq with another device, then there should
be no problems in that regard. Haven't ever heard of your symptoms.

On Linux, if you use jack, PD's ms setting won't make any difference on
audio, only midi. I wouldn't use any lower setting on PD than the lowest
you would use with jack.
To avoid glitches with jack, try using a high frames/period. Also, make
sure you are realtime capable, which should already be prepared on Puredyne.
Could be someone already had you're problem and discussed it on another
mail list. Alsa would be my strongest bet.

On 03/27/2011 12:19 AM, Billy Stiltner wrote:
> On 3/26/11, ailo <ailo.at at gmail.com> wrote:
>> Sounds like you have an interesting problem with your nvidia sound device.
>> Is the audio device a part of a graphic card by any chance?
>> Sounds like the graphics is interferring with the audio device, though
>> on puredyne the rtirq-init script together with the realtime kernel
>> should give higher priority to the audio device even when sharing irq
>> with other devices, if this is the source of your problem.
>> Perhaps Alsa would be interested to know of this problem? You could
>> subscribe to their mail list and let them know.
>>
>> Here are the Creative Labs devices supported by Alsa:
>> http://www.alsa-project.org/main/index.php/Matrix:Vendor-Creative_Labs
> 
> Thanks ailo for the link. I'm not sure if the audio card is seperate
> from the video and ethernet chip or not but they are all built into
> the motherboard. I'm going to look into the machine later. I could not
> find any info about the sound device from the computer manufacturere.
> Windows just lists the device as HD audio.
> 
> Yes I will check the alsa forums. I thought someone else on this list
> might have encountered the problem before. It is odd that only
> interaction with pd's gui objects causes the glitching and interaction
> with other windows does not. I still haven't tracked down the problem.
> 
> I think the sound device has it's own irq and is not shared with anything.
> 
> I'll have to check the device confiuration in vista and somehow match
> it on linux.
> I noticed in the pd config file there are settings for which audio
> device to use.
> 
> On another note I/O latency measured with MAX on Vista is 30 ms. I
> guess that is due to the 256 byte framebuffer and ASIO matching it's
> buffer to max's. I'm sure it is less with pd. It sure doesn't sound
> like 30ms though there is a definite delay when playing with the
> example fm synth.
> 
> perhaps a rewriting of tcl/tks  gui rendering to use hardware
> acceleration would help.
> 
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-- 
ailo