On Sun, 23 Mar 2003, R Parker wrote:
> What do you make of my IRQs, they're not consistent
> with what you're describing. Is this some newer bios
> aipc feature?
>
> The pci cards begin at 16 with two scsi controlers
> sharing interupt 16, at 18 we see a third scsi
> controler that isn't the same as the one on 16. It's
> just the same driver.
Ron, my dual mobo (asus a7m266-d) (amd-762 chipset)
also uses this IRQ system. As
discussed before I thought I had tamed latency problems, but
indeed I have not. When I run this command while 'jackd -R' is
running (and a client is connected) I get massive overruns on
the order of 1-2 *seconds* every 5 seconds or so:
dd if=/dev/zero of=/path/for/bigfile bs=1000 count=1000000
This will write a one gig file as fast as possible. My IDE
drives are tuned properly with hdparm and I'm using SMP
2.4.20 + LL + preemp + radeonDRM. Also tried with 2.4.18 + LL.
$ cat /proc/interrupts
CPU0 CPU1
0: 59143 60400 IO-APIC-edge timer
1: 1948 2013 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 1 IO-APIC-edge rtc
9: 0 0 IO-APIC-edge acpi
12: 12170 12203 IO-APIC-edge PS/2 Mouse
14: 12232 12459 IO-APIC-edge ide0
15: 52 159 IO-APIC-edge ide1
18: 0 0 IO-APIC-level Ensoniq AudioPCI
19: 6613 6657 IO-APIC-level eth0
NMI: 0 0
LOC: 119459 119465
(my AGP radeon7500 is on IRQ 16.. not shown above for some
reason).
Although my BIOS allows me to specify IRQs for slots, the numbers
there match the traditional style... not this >16 stuff. I tried
anyway, but no change in linux.
I just tried this test on another system, this one UP 2.4.20 +
LL, similar results. Anyone else care to try this informal
disk-loading test? If you have >= 1G of memory, use a
count=2000000 (2GB file).
jlc
