10 Feb
2013
10 Feb
'13
7:30 p.m.
On Sun, 2013-02-10 at 09:59 -0800, Len Ovens wrote:
On Sun, February 10, 2013 9:34 am, Louis Gorenfeld
wrote:
Sometimes it's possible to unbind devices, but I never experienced a
serious difference between a simple set up machine and a special tuned
machine:
$ cat tuning
#!/bin/bash
# sudo bash tuning - Ubuntu Studio Quantal
# 2012/Nov/04
### http://www.mythtv.org/wiki/PCI_Latency
###
http://wiki.linuxmusicians.com/doku.php?id=system_configuration#pci_bus_lat…
### Bluetooth
service bluetooth stop
### Network
#service network-manager stop
#service networking stop # does cause serious issues
#modprobe -r r8169 # Ethernet NIC driver
### TerraTec EWX 24/96
modprobe -r snd_ice1712
### Others
modprobe -r firewire-ohci
modprobe -r firewire_core
service cups stop
modprobe -r ppdev # parallel port
modprobe -r lp # printer
### Unbinding devices
echo -n "0000:00:13.2" > /sys/bus/pci/drivers/ohci_hcd/unbind
echo -n "0000:00:13.4" > /sys/bus/pci/drivers/ohci_hcd/unbind
### Log file
l="log/tuning.log"
#echo "$ lspci -v " > $l
#lspci -v >> $l
#echo >> $l
echo "$ /etc/init.d/rtirq status " > $l
/etc/init.d/rtirq status >> $l
echo "$ grep 18: /proc/interrupts" >> $l
grep 18: /proc/interrupts >> $l
echo >> $l
echo -n $(date)" - "$(uname -r)" - " >> $l
cat /etc/issue >> $l
echo "##############################" ; cat $l
exit 0
Also, grab rtirq and run that if you haven't.
I'd assume if you're
using a music-oriented distro that this is all already done.
Change the priority in the rtirq conig file before using it. It comes set
up to prioritize internal/pci sound devices over either USB or FW. Choose
a USB port and always use the same physical port (assuming you have picked
one on it's own irq) and put that USB port first... by going USB3
something something USB for example. This puts USB3 first and all the
other USB ports at the end. (USB3 happens to be the good one on my
machine, yours may be different)
This would be a great place for some automated setup BTW. A dialog that
pops up if you plug a USB sound card in to a port that uses a shared IRQ
suggesting to try another port even.