Re: [LAU] Re: Pops and clicks but no xruns

On Sun, Apr 08, 2007 at 01:38:34PM +0200, Karl Hammar wrote:
> Andrew Burgess <aab@email-addr-hidden>:
> > Paul Davis wrote:
> > >> What could cause clicks without xruns? I'm baffled.
> > >PCI bus hogging, for one thing. consider running a script like this
> ...
> > Here one that works automatically for all multimedia devices:
> > # find multimedia devices
> > pcis=$(lspci -v | grep Multimedia | awk '{ print $1; }')
> > if test -z "$pcis"; then
> > echo WARNING: no multimedia devices found on pci bus
> > else
> > for p in $pcis; do
> > echo set maximum latency timer for $p
> > setpci -s $p latency_timer=ff
> > done
> > fi
>
> It does not work for me:
>
> $ lspci | grep Multi | head -1 | cut -b-75
> 0000:00:05.0 Multimedia audio controller: nVidia Corporation nForce MultiMe
> $ setpci -s 0000:00:05.0 latency_timer
> lspci: -s: Invalid slot number
> $ setpci -s 00:05.0 latency_timer
> 00
>
> I have to remove the first 0000: from lspci, as in:
>
> $ cat /usr/local/sbin/pci.set.audio
> #!/bin/sh
>
> val=${1:-ff}
> # find multimedia devices
> pcis=$( lspci -n | grep ' 0401: ' | cut -f1 -d\ | cut -f2- -d: )
> if test -z "$pcis"; then
> echo WARNING: no multimedia devices found on pci bus
> else
> for p in $pcis; do
> lspci -s $p
> echo -en \\tmaximum latency timer:\
> setpci -s $p latency_timer | tr -s ' \n' ' '
> setpci -s $p latency_timer=$val > /dev/null
> echo -n '-> '
> setpci -s $p latency_timer
> done
> fi
> $
>

I am slightly confused. Is it necessary to increase the latency
timer for a pci sound card? This seems slightly
counter-intuitive. Wouldn't this reduce the performance of the
sound system through that card?

The only thing the above script changes on my system is the
latency of the SB Live.

James
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Received on Sun Apr 8 20:15:03 2007