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

Mon Nov 14 15:03:56 PST 2011

On 11/14/2011 02:46 PM, John S. Dey wrote:
> Hi Fernando,
>
> Thanks for your response and thanks for the new rt-kernel for fc15.  I did discover that I could run the prior rt as root and get decent results.  With the new kernel also running root I run with a latency of 5.33ms (64/4) with an occasional xrun using aeolus driven by aplaymidi.  As user (robo12) however, I get a message from qjackctl that says: Cannot use real-time scheduling  ...  and xruns occur.  I did add robo12 to jackuser group as Mark suggested.  Any further thoughts or suggestions would be appreciated.

You could try adding this file:

/etc/security/limits.d/99-planetccrma.conf

----
# Default limits for users of jack-audio-connection-kit
# for Planet CCRMA kernels

* - rtprio 99
* - memlock 4194304
----

(the limit for the default Fedora install is too low for the rt kernel + 
jack combination)
Let us know how it goes!
-- Fernando

> DEBUG:
>
> [robo12 at robo12 ~]$ cat /proc/asound/cards
>   0 [Intel          ]: HDA-Intel - HDA Intel
>                        HDA Intel at 0xee400000 irq 49
> 29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
>                        ThinkPad Console Audio Control at EC reg 0x30, fw 79HT50WW-1.07
>
> [robo12 at robo12 init.d]$ sudo ./rtirq status
> [sudo] password for robo12:
>
>    PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
>     84 FF      80   - 120  0.0 S    irq/8-rtc0	
>    915 FF      75   - 115  0.0 S    irq/49-hda_inte	
>     76 FF      70   - 110  0.0 S    irq/16-uhci_hcd	
>     77 FF      69   - 109  0.0 S    irq/17-uhci_hcd	
>     78 FF      68   - 108  0.0 S    irq/18-uhci_hcd	
>     79 FF      67   - 107  0.0 S    irq/19-uhci_hcd	
>     81 FF      65   - 105  0.0 S    irq/1-i8042	
>     80 FF      64   - 104  0.3 S    irq/12-i8042	
>     28 FF      50   -  90  0.0 S    irq/9-acpi	
>     44 FF      50   -  90  0.0 S    irq/40-PCIe PME	
>     45 FF      50   -  90  0.0 S    irq/41-PCIe PME	
>     46 FF      50   -  90  0.0 S    irq/42-PCIe PME	
>     47 FF      50   -  90  0.0 S    irq/43-PCIe PME	
>     48 FF      50   -  90  0.0 S    irq/44-PCIe PME	
>     49 FF      50   -  90  0.0 S    irq/41-pciehp	
>     50 FF      50   -  90  0.0 S    irq/42-pciehp	
>     51 FF      50   -  90  0.0 S    irq/43-pciehp	
>     52 FF      50   -  90  0.0 S    irq/44-pciehp	
>     60 FF      50   -  90  1.5 S    irq/45-ahci	
>     67 FF      50   -  90  0.0 S    irq/14-ata_piix	
>     69 FF      50   -  90  0.0 S    irq/15-ata_piix	
>     75 FF      50   -  90  0.0 S    irq/19-ehci_hcd	
>    209 FF      50   -  90  0.2 S    irq/46-radeon	
>    403 FF      50   -  90  0.0 S    irq/16-yenta	
>    903 FF      50   -  90  0.4 S    irq/48-iwl3945	
>   1178 FF      50   -  90  0.0 S    irq/47-p2p1	
>      3 FF       1   -  41  3.0 S    ksoftirqd/0	
>     18 FF       1   -  41  2.9 S    ksoftirqd/1	
>
> [robo12 at robo12 init.d]$
> [robo12 at robo12 ~]$ cat /proc/asound/cards
>   0 [Intel          ]: HDA-Intel - HDA Intel
>                        HDA Intel at 0xee400000 irq 49
> 29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
>                        ThinkPad Console Audio Control at EC reg 0x30, fw 79HT50WW-1.07
>
>
> qjackctl messages
>
> 17:15:41.870 Patchbay deactivated.
> 17:15:41.872 Statistics reset.
> 17:15:41.878 ALSA connection change.
> Cannot connect to server socket err = No such file or directory
> Cannot connect to server socket
> jack server is not running or cannot be started
> 17:15:41.891 ALSA connection graph change.
> 17:15:48.695 JACK is starting...
> 17:15:48.696 /usr/bin/jackd -dalsa -dhw:0 -r48000 -p64 -n4 -P
> Cannot connect to server socket err = No such file or directory
> Cannot connect to server socket
> jack server is not running or cannot be started
> no message buffer overruns
> 17:15:48.774 JACK was started with PID=3254.
> no message buffer overruns
> jackdmp 1.9.7
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2011 Grame.
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK server starting in realtime mode with priority 60
> control device hw:0
> control device hw:0
> audio_reservation_init
> Acquire audio card Audio0
> creating alsa driver ... hw:0|-|64|4|48000|0|0|nomon|swmeter|-|32bit
> control device hw:0
> configuring for 48000Hz, period = 64 frames (1.3 ms), buffer = 4 periods
> ALSA: final selected sample format for playback: 16bit little-endian
> ALSA: use 4 periods for playback
> Cannot use real-time scheduling (RR/60)(1: Operation not permitted)
> AcquireSelfRealTime error
> 17:15:50.986 JACK connection change.
> 17:15:50.989 Server configuration saved to "/home/robo12/.jackdrc".
> 17:15:50.989 Statistics reset.
> 17:15:50.997 Client activated.
> 17:15:51.006 JACK connection graph change.
> _____________________________________________________
> On Nov 13, 2011, at 6:23 PM, 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
>