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Old 07-24-2008, 08:48 PM
andy baxter
 
Default problems tuning pci latency for linux audio

hello,

I am trying to get the jackd audio daemon to work without xruns on my
system (a thinkpad X61s). At the moment it is not working at all because
there are too many xruns (more than one a second). I was following the
advice on a web page which said to use setpci to change the interrupt
priority like this:

setpci -v -s 00:1b.0 latency_timer=ff

lspci shows:

...
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
Subsystem: Lenovo ThinkPad T61
Flags: bus master, fast devsel, latency 0, IRQ 19
Memory at f8220000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+
Queue=0/0 Enable-
Capabilities: [70] Express Unknown type IRQ 0
...

However, the listing from lspci doesn't change after running setpci. Am
I doing something wrong, and is this the right way to improve audio
performance anyway?

Also, there is an option in the BIOS settings to change the IRQ used by
various devices; is this worth looking at?

any help appreciated.

andy.


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