On 12/14/11 13:55, Dave Phillips wrote:
Greetings,
I like my Arch system, but its rt performance is simply not so good as
my old 64 Studio installation.
Hello Dave,
Yeah, Arch is nice, I'm in the process of building up an Arch audio
machine too.
I think I have it optimized, but I wonder
if there isn't more I could do to eradicate the occurrrence of xruns
when recording with Ardour. Technical details follow.
uname -a reports these facts :
Linux BigBlack 3.0-ARCH #1 SMP PREEMPT x86_64 AMD Athlon(tm) 64
Processor 3200+
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?
I know about nice. IIRC these settings were default values.
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.
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@BigBlack 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.
If so, how and in what order ? I
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.
Btw, I know that
an updated kernel is available from pacman and will gladly install it if
recommended.
The 3.0-rt kernel from AUR works amazingly well afaics, but I didn't
stretch test it yet. Arch is nice but it lacks a whole bunch of plug-ins
I need so have to take care of that first.
Please advise if other information is required.
What DE are you using?
Suggestions and recommendations are most welcome. However, before
recommending an rt kernel please note that I need hardware accelerated
3D. Ditching the nVidia binary is not really an option yet, so any
suggested kernel must get along with the nVidia driver.
Best,
dp
Best,
Jeremy
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