linuxaudio.org

On 5 September 2012 at 22:28, "Len Ovens"  wrote:
>

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> On Wed, September 5, 2012 12:24 pm, Kevin Cosgrove wrote:

>

> >> cat /proc/interrupts

> >

> > Xrunning system says:

> >

> >        CPU0   CPU1   CPU2   CPU3   CPU4   CPU5   CPU6   CPU7

> > 16:    56322  0      0      0      0      0      0      0

> > IO-APIC-fasteoi   ahci, ehci_hcd:usb1, firewire_ohci, snd_ice1712, nvidia

>

> That would give me xruns too.

OK.  I see it now.  I've never had to fight the interrupt problem

before.
> I was able to change slots. Also try to keep some distance

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> between the video card and the audio card.

There are two PCI (legacy) slots in this ASUS P8Z68 DELUXE GEN3

1155 Motherboard.  I intend to use both of them as I have a pair

of M-Audio Delta 1010 audio adapters.
> (if you can) See if you can set IRQ in the bios for that slot

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> to something else if there is only one.

I'll look at the manual for my MB and see what I can do.
> I find the same thing with USB audio. I have to find a USB plug

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> on my laptop that does not share irq with anything else and

> only plug the audio IF in that one plug.

>

> > Fine system says:

> >

> >  17:      0      0      0      0   IO-APIC-fasteoi ICE1712

>

> Nice.

A happy accident.
> >> cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

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> >

> > Xrunning system says:

> >

> >   ondemand

> >   ondemand

> >   ondemand

> >   ondemand

> >   ondemand

> >   ondemand

> >   ondemand

> >   ondemand

>

> What may help if you don't want to use performance is to set it

> to user and then set a lower than top speed. I seem to get less

> problems setting my system to 50% speed than with the (faster)

> ondemand setting.

>

> cpufreq-set and cpufreq-info are great to play with this stuff.

> the -info one will tell you what frequencies you can choose

> from. I found choosing the exact frequency didn't always work,

> slightly higher or lower would though. Play with it. Read the

> man page. My laptop runs at 1.6Ghz, but also has 1.33, 1.06

> and .8. I can do a lot more than I would think at 800Mhz as it

> turns out.

Very interesting.
It's also interesting that my system with no xruns has RT priority

for jackd turned OFF.   ???   I just discovered that last night.
> rtirq can help. If used wrong it can make things worse... for

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> example the stock setting is bad for FW or USB audio IFs.

Wow.
> It comes with the snd first or second. as someone else says in another

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> message put snd_ice1712 and then snd after. This will put your internal IF

> in it's proper place, second.

That makes sense.  The internal IF is only used for playing my music

collection's files and the audio for on-line things.
> I do the same with USB cards. I find out which USB plug has no

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> other irqs with it (USB3 on mine) and put : usb3 snd usb as the

> order. This puts my external audio first, then the internal

> crap audio and then whatever other usb stuff there is (in a

> laptop that includes webcam in the lid and SD reader and maybe

> other things too...

I'm only using USB for mass storage.  Eventually I hope that my

Behringer BCF2000 will be usable again with ardour.  I'm hoping

ardour 3 will restore that functionality.
> take a look through dmesg for all the stuff that is USB)
In order to look for conflicting IRQs with my audio interface?
> Be aware that putting: snd-ice1712 snd will put all that other

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> stuff on irq 16 between your ice and your internal card and you

> may wish to explicitly make them lower. Check your priorities

> after you have it going:

>

> ps -eLo pid,cls,rtprio,pri,nice,cmd | grep -i irq

>

> Look at the third column over.

This is looking as complicated as slackware was in 1996, back

when I had to build a special kernel with each OS release.
Thanks for the detailed info!
--

Kevin
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