On Sun, 11 Feb 2007, Leo Ann Boon wrote:
Matt wrote:
I guess the question is... is it even possible to have a real-time VoIP
card running on PCIe? Or with 1,000 Interrupts a second.. does it simply
need to have its own IRQ?
Have you tried the Sangoma PCIe cards?
APIC is supposed to fixed the PCI IRQ problem. AFAIK, APIC is not a virtual
interrupt. It requires an additional interrupt controller to deal with the
additional interrupt lines. The BIOS cannot see it because it's still stuck
with the 8086 15-interrupt mindset. When you run a modern OS like Windows XP
and Linux, the OS can will make the CPU aware of the additional interrupts
from the secondary interrupt controllers. At the BIOS level, you'll see
'shared' interrupts for APIC system because the mobo designer need to cascade
the new interrupt controller to the standard controller. Otherwise, the
interrupts from the secondary controller will not be available to real-mode
applications.
If the above would work like it was meant to be why do many cards still
have irq problems? In zttest i only get 99.987793% scores, not higher,
not lower only a very rare 100%.
My cheap ass Asus A78VX-X board scores considerably better then this
expensive Dell machine with the same Digium card and software installed.
I have apic enabled, disabling apic from the kernel did not help to
improve things
My simple conclusion from the above is that the Dell hardware sucks.
result from zttest :
--- Results after 198 passes ---
Best: 100.000000 -- Worst: 99.987793 -- Average: 99.988498
[EMAIL PROTECTED] zaptel-1.2.13]# cat /proc/interrupts
CPU0
0: 82179609 IO-APIC-edge timer
2: 0 XT-PIC cascade
8: 1 IO-APIC-edge rtc
14: 738454 IO-APIC-edge ide0
74: 82142210 IO-APIC-level wct2xxp
201: 745906 IO-APIC-level megaraid
209: 137704 IO-APIC-level eth0
217: 177366 IO-APIC-level eth1
NMI: 0
LOC: 82178536
ERR: 0
MIS: 0
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