Re: [LAU] eliminating xruns on 64-bit Arch ?

On 12/14/2011 08:58 AM, Jeremy Jongepier wrote:
> On 12/14/11 13:55, Dave Phillips wrote:
>> The relevant entries in /etc/security/limits.conf
>>
>> @audio - rtprio 99
>> @audio - nice -10
>> @audio - memlock unlimited
>>
>
> You could check /etc/security/limits.d/99-audio-conf
> I wonder though if both files exist if they don't conflict. What does
> ulimit -r -m output?
>

It checks out:

     [dlphilp@email-addr-hidden ~]$ ulimit -r -m
     real-time priority (-r) 99
     max memory size (kbytes, -m) unlimited

>>
>> The hardware is an M-Audio Delta 66 system, with a separate preamp. Some
>> relevant JACK (0.121.3) settings :
>>
>> /usr/bin/jackd -P89 -t5000 -dalsa -dhw:0 -r48000 -p128 -n2 -Xseq
>>
>
> The seq driver can cause xruns. You can rule it out as a possible
> cause by using a2jmidid.
>

Ah, okay, it's removed. I'll test later this afternoon, can't use the
recorder at the moment.

>> I usually get two or three xruns per half-hour session, as compared to 0
>> with 64 Studio. Btw, I'm not comparing the distros, just the performance
>> stats. I have no interest in returning to older systems, but I have much
>> interest in improving the ones I'm running now.
>>
>> This bothers me :
>>
>> [dlphilp@email-addr-hidden etc]$ cat /proc/interrupts
>> CPU0
>> 0: 50 IO-APIC-edge timer
>> 1: 4 IO-APIC-edge i8042
>> 7: 1 IO-APIC-edge parport0
>> 8: 2 IO-APIC-edge rtc0
>> 9: 0 IO-APIC-fasteoi acpi
>> 12: 6 IO-APIC-edge i8042
>> 14: 0 IO-APIC-edge pata_amd
>> 15: 27164 IO-APIC-edge pata_amd
>> 16: 788897 IO-APIC-fasteoi ICE1712, nvidia <---- Ouch !!!
>> 17: 144 IO-APIC-fasteoi firewire_ohci
>> 20: 49995 IO-APIC-fasteoi ohci_hcd:usb2
>> 21: 87877 IO-APIC-fasteoi sata_nv
>> 22: 2124 IO-APIC-fasteoi sata_nv, hda_intel
>> 23: 82436 IO-APIC-fasteoi ehci_hcd:usb1, eth0
>>
>> Yep, that's my video card. Can I reassign the IRQ - preferably via
>> software - for one of those devices ?
>
> No, afaik only if your system supports MSI and it looks like it
> doesn't (unless you didn't post the whole output). But I'm no expert
> on this so I could be mistaken. You could try swapping ports for the
> ICE1712.
>

I'm considering it. IIRC there are only two or three PCI slots on the
mobo, and the nVidia card is in a PCIe slot.

>
>> know about the rtirq script but there seems to little information
>> regarding its use with a kernel such as mine (Rui ?).
>
> With your current non-rt kernel you have to use the threadirqs kernel
> option. From then on you could install rtirq from AUR though that's
> not the most recent version so you might have to modify the PKGBUILD.
>

I planned on using the latest from Rui's site, it's dated October 2011.

>
>
> The 3.0-rt kernel from AUR works amazingly well afaics, but I didn't
> stretch test it yet.

I'll check it out asap.

>
> What DE are you using?

Xfce4

Thanks for the suggestions, Jeremy. I'm going to run some tests now.

Best,

dp

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Received on Wed Dec 14 16:15:03 2011