[PlanetCCRMA] Reliable version of Fedora using rt-kernel?

mark mark at noisemaker.nl
Sun Nov 13 23:11:00 PST 2011


as far as i know the Kernel is already RT patched. I have tried 
to compile Kernel 3 with patch at debian 6 but it didn`t  run better. 
The latency was worse than without the patch. Anyway don`t forget to 
input those two lines for jackd into the limits.conf and add your user 
to the desired group.

i would suggest to use either Kernel or just Ubuntu Studio 
11.04 (not 11.10!!!).



On 14.11.2011 00:23, Fernando Lopez-Lezcano wrote:
> On 11/13/2011 12:05 PM, John S. Dey wrote:
>> Hi Fernando,
>> Thanks for getting back to me. No. You're presumption was incorrect. I
>> hadn't install rtirq. I have now but it didn't make much different.
> (it does not necessarily make a difference, basically it tries to give
> better priority to the soundcard hardware interrupts, to test you have
> to reboot or - as root - do a "/sbin/service rtirq start" from a
> terminal... just in case you did not)
> -- Fernando
>> On Nov 12, 2011, at 9:17 PM, Fernando Lopez-Lezcano wrote:
>>> On 11/12/2011 02:06 PM, John S. Dey wrote:
>>>> Hi,
>>>> I'm currently using 3.0.7-1.rt20.1.fc15.ccrma.x86_64.rt as my kernel
>>>> on fc15 running on a thinkpad T60p with ATI graphics. I haven't been
>>>> able to find settings for jackd that produce reliable real time
>>>> performance. In the past I could achieve latency as presented in
>>>> qjackctl of less than 10ms. Now I get xruns with latencies of 40ms
>>>> and more. The stock kernel is just as good.
>>> What soundcard do you have and what parameters did you use for jack?
>>> (just curious).
>> cat /proc/asound/cards
>> 0 [Intel ]: HDA-Intel - HDA Intel
>> HDA Intel at 0xee400000 irq 49
>> 1 [Set ]: USB-Audio - C-Media USB Headphone Set
>> C-Media USB Headphone Set at usb-0000:00:1d.0-2, full speed
>> 29 [ThinkPadEC ]: ThinkPad EC - ThinkPad Console Audio Control
>> ThinkPad Console Audio Control at EC reg 0x30, fw 79HT50WW-1.07
>> I have varied Frames/Period and Periods/Buffer (2,3 and 4) but haven't
>> been able to get
>> stable results better that what is shown. I ran with both sound cards
>> shown above. The rt kernel wasn't any better that the up to date stock
>> kernel.
>> Thanks,
>> John
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