Joe Hartley wrote:
This has been a very timely discussion. I just got my son a new mobo, CPU
and RAM, and he's been having a lot of trouble using jack, ardour and hydrogen
until I followed the advice here and tuned his machine up. Thanks all!
On Sat, 20 Jan 2007 12:21:58 -0500
Rick Wright <riwright@xxxxxx> wrote:
Thus, your command should be something like :
/usr/bin/chrt -f -p 90 `pidof "IRQ 10"`
Here's a novel twist on all of this: my sound and video cards don't seem
to exist on my FC5 system, so I can't run this command!
For example, my audio card is a Delta 1010. lspci -v shows it:
02:0b.0 Multimedia audio controller: VIA Technologies Inc. ICE1712 [Envy24] PCI Multi-Channel I/O Controller (rev 02)
Subsystem: VIA Technologies Inc. M-Audio Delta 1010
Flags: bus master, medium devsel, latency 64, IRQ 11
I/O ports at df80 [size=32]
I/O ports at dfa0 [size=16]
I/O ports at df60 [size=16]
I/O ports at df00 [size=64]
Capabilities: [80] Power Management version 1
However, it's not in /proc/interrupts, and trying to use chrt as shown
above fails:
[root@xtc ~]# cat /proc/interrupts
CPU0 CPU1
0: 67992 2883426 IO-APIC-edge [........N/ 0] pit
1: 8 0 IO-APIC-edge [........./ 0] i8042
8: 1 0 IO-APIC-edge [........./ 0] rtc
9: 0 1 IO-APIC-level [........./ 0] acpi
12: 96 0 IO-APIC-edge [........./ 0] i8042
14: 6779 89 IO-APIC-edge [........./ 2] ide0
15: 28172 6252 IO-APIC-edge [........./ 2] ide1
17: 2 0 IO-APIC-level [........./ 0] ehci_hcd:usb1
18: 31 0 IO-APIC-level [........./ 0] uhci_hcd:usb2
19: 1276 0 IO-APIC-level [........./ 0] skge
NMI: 0 0
LOC: 2951050 2954633
ERR: 0
MIS: 0
[root@xtc ~]# chrt -f -p 82 `pidof "IRQ 11"`
sched_getscheduler: No such process
failed to get pid 82's policy
Hmmm, where's the process for IRQ 11??
You can check for the pid with:
ps -Leo pid,pri,rtprio,cmd | grep IRQ
The first column is the pid, the third is the rtprio, which is what gets
set by the "chrt" command I posted previously. This is a good check
that you are able to set the "rtprio" value.
Once you have that pid, do:
/usr/bin/chrt -f -p 82 <pid>
The back-ticks and quotes are only required when this command is put in
a script.
[root@xtc ~]# ps -ef | grep IRQ
root 33 27 0 15:28 ? 00:00:00 [IRQ 9]
root 249 27 0 15:28 ? 00:00:00 [IRQ 8]
root 268 27 0 15:28 ? 00:00:00 [IRQ 12]
root 296 27 0 15:28 ? 00:00:00 [IRQ 14]
root 299 27 0 15:28 ? 00:00:00 [IRQ 15]
root 350 27 0 15:28 ? 00:00:00 [IRQ 1]
root 838 27 0 15:28 ? 00:00:00 [IRQ 17]
root 860 27 0 15:28 ? 00:00:00 [IRQ 18]
root 897 27 0 15:28 ? 00:00:00 [IRQ 19]
root 1133 27 0 15:28 ? 00:00:00 [IRQ 6]
I'm really baffled here! Has anyone seen this? My video card (listed
as having IRQ 18) is equally missing in action as well. Thanks for any
clues sent this way.
