[Asterisk-Users] Re: Audio problems on Zap & SIP, local network, not IRQ related?

[whois wes]

make sure you have disabled irqbalance - i didn't see anywhere where
you had, so i'm assuming you haven't...

irqbalance will automatically redistribute the IRQ affinity to
whatever CPU has the lowest usage...for the most part, it shouldn't
hurt anything, but i'm with you on making sure the cards are
interrupting on their own CPU.

FYI, we've had quite a few problems with sound quality, using Fedora
Core 4 on our Dell 2850's - moving to Sangoma pretty much resolved the
issue.  I also just finished debugging a system that was having all
sorts of sound issues, and a simple recompile of zaptel/asterisk
seemed to do the trick (i did move from asterisk 1.2.4 to 1.2.7.1, but
i think it was the zaptel recompile that did it).

hope this helps

wes

On 6/9/06, kjcsb <kjcsb at orcon.net.nz> wrote:
> > I've read your post on the asterisk mailing list. Agree that the specs
> > of that box should easily handle one call with decent quality. The only
> > thing I can think of right now is to start using the IRQ affinity stuff
> > to move the scsi & ethernet modules over to e.g. CPU2 and let the wctdm
> > driver stick to CPU1. You may also want to read the part about setting
> > the latency of the card. Iirc the higher the value the better it is for
> > a Digium card but check it in the docs at
> > http://www.asteriskguru.com/tutorials/pci_irq_apic_tdm_ticks_te410p_te405p_noise.html
> > or the attached file.
> >
> I have attempted to change the SMP affinity so that the TDM400 is handled by
> CPU1:
> echo 2 > /proc/irq/20/smp_affinity
> cat /proc/irq/20/smp_affinity
> 00000002
>
> However I can see the interrupts for IRQ 20 are still incrementing on both
> CPUs. Indeed, after about 10 seconds...
> cat /proc/irq/20/smp_affinity
> 00000001
>
>
> On further investigation, the SMP affinity on ALL of the IRQs is set to
> 00000001. This implies that everything is handled by CPU0, which it clearly
> is not!
>
> I'll do some more research on this but in the meantime if anyone has any
> advice on this issue I would appreciate it.
>
> > I'm not familiar with the megaraid module. You seem to have an adaptec
> > scsi controller. Why need the megaraid module? And if you don't need the
> > usb uhci module, disable usb in the bios. Come to think of it, since you
> > use scsi, disable the IDE ports too.
> Megaraid is Dell's SCSI hardware RAID controller (this is a Dell Poweredge
> 2300). I believe the Adaptec stuff is what the Tape, CDROM(!) etc run off.
> There are no options in the BIOS to disable USB or IDE.
>
> > Just saw your other posting to the asterisk mailing list. Afaik it is
> > not advisable to use MMX so disable it in the Makefile again and
> > recompile. I don't know which distro you use but if it's CentOS, RHEL or
> > Fedora Core 4 or 5 you can use the rpms at http://laimbock.com/asterisk/
> >
> > Regards,
> > Patrick
> >
> I'm running FC4 but some files are patched for New Zealand so I don't think
> I can use these RPMs.
>
> Regards
>
> Cameron
>
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