There's more to this than that, but my advice would be to not even bother until you've built a fresh kernel over the RedHat one. (check out the list archives -- you're not the only one with this problem).
I'm right in the middle of something that may have a huge impact on all the IRQ latency issues everyone's been having. Let me know if you're interested in using your system as a guinea pig.
I'm running vanilla linux-2.6.9 over Fedora 2/3. I've replaced a GigaByte MB/VIA chipset with an ASUS MB/nVIDIA and still get the spike. I've purchased additional TDM22B boards. In fact, I've replaced every bit of hardware several times over--from mother boards to Digium cards to fax machines. And I've tried both i386 and x86_64 architectures.
I get the spikes with both the TDM22B and T100P cards. The spikes begin when the Digium modules are loaded, and the CPU utilization goes to solid 100% idle when the Digium modules are unloaded.
I use 'vmstat 1' to monitor CPU utilization. The system (not userspace) utilization goes to 40% every three seconds. This spike is usually within a one second interval but is sometimes spread across two intervals (say 10% system utilization in the first interval, 30% in the next interval). During the one second vmstat interval, the spikes occur without a corresponding increase in the number of interrupts, and this tells me an interrupt is being held for a very long time--200-400ms.
The end result is that the spandsp transmission is corrupted with garbage printed at the fax machine.
I'm really discouraged at Digium's disinterest in this problem. I understand they have limited resources with lots to do, but it only takes a minute to reply to my email to say either they are aware or not aware of the problem.
Thanks Jim, I'd be interested in assisting.
Mike
-- Michael Welter Introspect Telephony Corp. Denver, Colorado US +1.303.674.2575 [EMAIL PROTECTED] www.introspect.com _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
