Re: [LAT] To much latency

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To: <linux-audio-tuning@...>
Date: Tuesday, November 1, 2011 - 12:25 am

Hello Everyone,

I'm having a similar problem so I'll take the liberty to jump into this
thread, let me know if I should create a new thread instead.

My laptop is a MacBookPro8,1 with i7 processor, 8GB ram, built-in intel
HDA soundcard, dual boot setup with mac os + jack + ardour and 64 bit
Ubuntu Studio 11.04 + jack + ardour + QTractor.

On MacOS, jack works really well with the default settings:
/usr/local/bin/jackd -R -d coreaudio -p 64 -r 44100 -i 2 -o 2 -C
AppleHDAEngineInput:1B,0,1,0:1 -P AppleHDAEngineOutput:1B,0,1,1:0

But on Ubuntu, the only way I can get sound that sounds clear (no
distortion or clicks) is by setting the "force 16 bit" flag and 4096
frames. I tried some of the troubleshooting guides out there and
compiled the latest version of ALSA but the result was the same. I also
tried AVLinux which comes with a preemptive kernel but still the same :(

Also, If I use ALSA directly on an application that supports it
(pd-extended for example) the latency feels a lot shorter than using
jack with the settings I described (I havent measured it, don't know how).

If it helps, here's the output of cat /proc/asound/card*/codec* | grep
-i codec

Codec: Cirrus Logic CS4206
Codec: Intel CougarPoint HDMI

Has anyone successfully setup this kind of sound card on Linux + Jack?
Any tips on setting up jack?

Thanks!

RV.

On 10/31/2011 06:58 AM, Jeremy Jongepier wrote:

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Messages in current thread:
[Linux-audio-tuning] test, MarcOChapeau, (Sun Jul 27, 11:34 am)
[LAT] hello, dyne:bolic -rt and freeeee, jaromil, (Wed Sep 10, 2:06 pm)
[LAT] BIOS and IRQ, Grammostola Rosea, (Wed Nov 26, 8:55 pm)
[LAT] Setting up a performance synth, David McClanahan, (Wed Jan 13, 9:55 pm)
[LAT] We're back online !, Marc-Olivier Barre, (Thu Apr 22, 8:10 pm)
[LAT] presonus firebox and 2.6.31-9-rt gives tons of xruns, yvan volochine, (Tue May 18, 10:45 am)
[LAT] Document on using Jack Apps, Arvind Venkatasubramanian..., (Sat Jul 31, 10:23 pm)
[LAT] rt kernel 2.6.39, Emanuel Rumpf, (Sun May 29, 11:56 am)
[LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 11:02 am)
[LAT] 3.x kernel, Emanuel Rumpf, (Wed May 2, 8:48 pm)
Re: [LAT] 3.x kernel, Robin Gareus, (Wed May 2, 8:51 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 11:25 am)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 11:55 am)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 12:03 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 12:23 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 1:50 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 2:13 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 2:19 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 2:39 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Mon Oct 31, 11:59 am)
Re: [LAT] To much latency, Dave Stikkolorum, (Tue Nov 1, 4:17 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Wed Nov 2, 5:34 pm)
Re: [LAT] To much latency, Rafael Vega, (Tue Nov 1, 12:25 am)
Re: [LAT] To much latency, Daniel James, (Tue Nov 1, 10:04 am)
Re: [LAT] To much latency, Rafael Vega, (Thu Nov 3, 12:33 pm)
Re: [LAT] To much latency, email.rafa@gmail.com, (Thu Dec 22, 2:50 pm)
Re: [LAT] rt kernel 2.6.39, Robin Gareus, (Sun May 29, 1:43 pm)
Re: [LAT] rt kernel 2.6.39, Emanuel Rumpf, (Sun May 29, 2:39 pm)
Re: [LAT] rt kernel 2.6.39, Robin Gareus, (Mon May 30, 3:52 pm)
Re: [LAT] Document on using Jack Apps, Daniel James, (Tue Aug 3, 6:48 pm)
Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: &gt;..., Lars-Erik Helander, (Mon Feb 2, 8:53 am)
Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: &gt;..., Fernando Lopez-Lezcano, (Mon Feb 2, 6:35 pm)