RME HDSP Multiface Windows vs Linux & Jack

[sem]

Hi
I've newly installed a desktop system with dual boot
windows/ubuntuStudio and discovered something exiting.

If I play around with ZynAddSubFX in Windows, I can adjust the card to
64 frames 96000KHz and play with 1,5 ms latency without any kind of
sound glitch or interrupts at all.

If I try the same with UbuntuStudio and jack I get a lot of X-runs as I
play, in a serious situation it's no good, especially as I'm beginning
to use effects in and out of my Multiface in real time for example guitar.

Now that I discovered that my card is fully capable of playing with
extreme low latency I'm not quite satisfied with running 20ms or more in
UbuntuStudio or any other Linux DAW.

Is there anything I can do to tune my jack installation to obtain lower
latency and more stability with my card, so far I haven't had any luck
tweaking the jack settings.

Thanks in advantage.


/Sv-e
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[Paul Davis]

On Tue, 2008-07-22 at 10:19 +0200, Svend-Erik Kjær Madsen wrote:

> Hi
> I've newly installed a desktop system with dual boot
> windows/ubuntuStudio and discovered something exiting.
>
> If I play around with ZynAddSubFX in Windows, I can adjust the card to
> 64 frames 96000KHz and play with 1,5 ms latency without any kind of
> sound glitch or interrupts at all.
>
> If I try the same with UbuntuStudio and jack I get a lot of X-runs as I
> play, in a serious situation it's no good, especially as I'm beginning
> to use effects in and out of my Multiface in real time for example guitar.
>
> Now that I discovered that my card is fully capable of playing with
> extreme low latency I'm not quite satisfied with running 20ms or more in
> UbuntuStudio or any other Linux DAW.
>
> Is there anything I can do to tune my jack installation to obtain lower
> latency and more stability with my card, so far I haven't had any luck
> tweaking the jack settings.

Have you used google to research this at all? Do you use JACK in
RT-mode?


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[Brett McCoy-2]

On Tue, Jul 22, 2008 at 4:19 AM, Svend-Erik Kjær Madsen <sv-e@...> wrote:

> I've newly installed a desktop system with dual boot
> windows/ubuntuStudio and discovered something exiting.
>
> If I play around with ZynAddSubFX in Windows, I can adjust the card to
> 64 frames 96000KHz and play with 1,5 ms latency without any kind of
> sound glitch or interrupts at all.
>
> If I try the same with UbuntuStudio and jack I get a lot of X-runs as I
> play, in a serious situation it's no good, especially as I'm beginning
> to use effects in and out of my Multiface in real time for example guitar.
>
> Now that I discovered that my card is fully capable of playing with
> extreme low latency I'm not quite satisfied with running 20ms or more in
> UbuntuStudio or any other Linux DAW.
>
> Is there anything I can do to tune my jack installation to obtain lower
> latency and more stability with my card, so far I haven't had any luck
> tweaking the jack settings.

How are you using Jack, specifically? Is your kernel real-time? I have
a similar setup (Windows and Fedora/CCRMA) and HDSP worked out of the
box for me in Linux. Granted, I don't use the card at 96K, though.

-- Brett
------------------------------------------------------------
"In the rhythm of music a secret is hidden;
 If I were to divulge it, it would overturn the world."
 -- Jelaleddin Rumi
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[Nedko Arnaudov]

Svend-Erik Kjær Madsen <sv-e@...> writes:

> Hi
> I've newly installed a desktop system with dual boot
> windows/ubuntuStudio and discovered something exiting.
>
> If I play around with ZynAddSubFX in Windows, I can adjust the card to
> 64 frames 96000KHz and play with 1,5 ms latency without any kind of
> sound glitch or interrupts at all.
>
> If I try the same with UbuntuStudio and jack I get a lot of X-runs as I
> play, in a serious situation it's no good, especially as I'm beginning
> to use effects in and out of my Multiface in real time for example guitar.
>
> Now that I discovered that my card is fully capable of playing with
> extreme low latency I'm not quite satisfied with running 20ms or more in
> UbuntuStudio or any other Linux DAW.
>
> Is there anything I can do to tune my jack installation to obtain lower
> latency and more stability with my card, so far I haven't had any luck
> tweaking the jack settings.

ZynAddSubFX has realtime issues. Linux realtime setup is quite sensitive
to misbehaving programs.

--
Nedko Arnaudov <GnuPG KeyID: DE1716B0>


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[plutek-infinity]

>Date: Tue, 22 Jul 2008 10:19:15 +0200
>From: =?ISO-8859-1?Q?Svend-Erik_Kj=E6r_Madsen?= <sv-e@...>
>Hi
>I've newly installed a desktop system with dual boot
>windows/ubuntuStudio and discovered something exiting.
>
>If I play around with ZynAddSubFX in Windows, I can adjust the card to
>64 frames 96000KHz and play with 1,5 ms latency without any kind of
>sound glitch or interrupts at all.
>
>If I try the same with UbuntuStudio and jack I get a lot of X-runs as I
>play, in a serious situation it's no good, especially as I'm beginning
>to use effects in and out of my Multiface in real time for example guitar.
>
>Now that I discovered that my card is fully capable of playing with
>extreme low latency I'm not quite satisfied with running 20ms or more in
>UbuntuStudio or any other Linux DAW.
>
>Is there anything I can do to tune my jack installation to obtain lower
>latency and more stability with my card, so far I haven't had any luck
>tweaking the jack settings.

i've used the multiface at 96kHZ a lot (but not at 96000kHz -- hehe!) with no trouble. there are a lot of reports of xrun issues with the current version of ubuntustudio, so you may wish to try SUSE/Jacklab, 64studio, or Planet-CCRMA.

cheers!

--
.pltk.
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[Paul Davis]

On Tue, 2008-07-22 at 09:11 -0400, plutek-infinity wrote:

>
> i've used the multiface at 96kHZ a lot (but not at 96000kHz -- hehe!) with no trouble. there are a lot of reports of xrun issues with the current version of ubuntustudio, so you may wish to try SUSE/Jacklab, 64studio, or Planet-CCRMA.

hint: think of a particular distro as like an instance of windows just
after a new service pack was installed that may have destroyed or
improved real time media handling.

:)



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[Cory K.-3]

plutek-infinity wrote:

>> Date: Tue, 22 Jul 2008 09:38:02 -0400
>> From: "Cory K." <coryisatm@...>
>>    
>
>  
>> plutek-infinity wrote:
>>    
>>> i've used the multiface at 96kHZ a lot (but not at 96000kHz -- hehe!) with no trouble. there are a lot of reports of xrun issues with the current version of ubuntustudio, so you may wish to try SUSE/Jacklab, 64studio, or Planet-CCRMA.
>>>      
>> Can you point out these reports?
>>    
>
> sure... check this thread:  http://ubuntu-utah.ubuntuforums.org/showthread.php?t=781104
> and my experience has been similar -- more xruns with an untweaked install of ubuntustudio than with the others.
>  

This particular one was a kernel bug that was fixed. So really not a
good example. I just take a little issue (since I'm the lead on Studio)
with "lots of reports of xruns" when I can say the same about any
distro. :P People in that thread even mentioned having no issues.

Any concrete "This is giving me xruns" examples/bugs are welcome.

One thing that I have seen is that if you add network-manager you can
start to get xruns. The min I add it here it starts. Couple of forum
threads mention it as well as emails.

> btw... any particular reason you went off-list with this, or shall we copy back to the list as well?
>  

Just didn't hit "reply to all".

-Cory K.

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