[PlanetCCRMA] FC17 RT Performance

John S. Dey john at jsdey.com
Wed Jul 18 15:51:15 PDT 2012


Well I am making progress.  In qjackctl settings--realtime button was checked.  The priority was set to default (I think).  Anyway--I set the priority to 66 and I am running 5.33ms (no xruns).  I haven't loaded the system to any degree yet but plan to soon.  A ps on jackd now shows: /usr/bin/jackd -P66 -dalsa -dhw:0 -r48000 -p128 -n2 -P.  I can't get rid of the trailing -P.  I cleared .jackdrc but it just reset to the same value on re-invocation of qjackrc.  How can I get rid of the trailing -P?

With the testing I have been doing I have been using the stock sound card from Intel that came with the machine.

I have been getting an error when starting qjackctl: "Could not open ALSA sequencer as a client.  Alsa MIDI patchbay will not be available."  I assume I'm missing an application.  Any idea what its called or if it not a missing application any ideas how to clean up the error?  Many thanks again for all you do.


On Jul 17, 2012, at 12:31 AM, Fernando Lopez-Lezcano wrote:

> On 07/16/2012 01:20 PM, John S. Dey wrote:
>> Hi Fernando,
>> Ever since I installed FC17 I have lost the blazing rt performance of 5.3 ms I had with FC16.  I have the latest rt kernel installed and have checked to see the rtirq has been install also.  I see that irq/8-rtc0 is at 70 and the sound card is at 69.  The jack server starts at 60.  The best I can achieve is 10 ms (256(2)) at playback only mode.  The performance is that same for ether root or user mode. I have a lenovo T60p laptop.  My guess is that I have forgotten an important configuration step.  Any thought would be greatly appreciated.
> Does not look like you forgot anything from what you say, but it smells like something is missing (so far my tests here with fc17 are good - my test laptop is a T61). Are you running Jack with "-R"? (if you started your qjackctl configuration from scratch maybe that is not set?). Which soundcard are you using? Do you remember which kernel you were using in fc16?
> -- Fernando

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