25 Oct
2011
25 Oct
'11
12:09 p.m.
I'm one of the folks performing through a netbook. A dell latitude 2100 --
the rubberized primary-school edition, 2gb ram and one of the atom chipsets.
Maybe now in the $300 range?
I use fluidsynth and bristol with alsa and jackd, setting various patches
across 8 midi channels, playing through an m-audio usb sound processor, with
one or sometimes two usb midi devices as controllers.
I custom-compiled a very lightweight rt kernel. I still use gnome, but turn
off networking to prevent memory usage spikes not related to music... and
keep a close eye on the available system memory and cpu while playing. Also
no holding bristol chords with more than 5 notes. :) I could probably get up
to 7 if I lost gnome, but I prefer the minimalist musical approach to
avoiding xruns. And I like to be able to use the dell's touchscreen to flip
through scanned charts in pdf when I forget what I'm supposed to be playing!
Cheers,
Luke
-----
Luke Peterson
- sent via mobile device -
On Oct 25, 2011 5:11 AM, "Jeremy Jongepier" <jeremy(a)autostatic.com>
wrote:
On 10/25/2011 10:44 AM, Renato wrote:
No, writing the ID of the controller to an unbind file, it's the last
line in the startstudio script.
On Tue, 25 Oct 2011 10:20:18 +0200
Jeremy Jongepier <jeremy(a)autostatic.com> wrote:
Hi Renato,
Yes:
if [ $(uname -r | cut -d "-" -f 3) = "realtime" ]
then /path/to/startstudio
fi
And the 'startstudio' script looks like this:
#!/bin/sh
modprobe -r ppdev
modprobe -r lp
modprobe -r uvcvideo
modprobe -r videodev
modprobe -r ath9k
modprobe -r r8169
modprobe -r btusb
/etc/init.d/bluetooth stop &
/etc/init.d/cups stop &
/etc/init.d/networking stop &
/etc/init.d/network-manager stop &
/etc/init.d/ondemand stop
killall modem-manager
killall wpa_supplicant
modprobe snd-hrtimer
echo -n performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
TASKLETPR=76
ps -eLo pid,cmd | grep tasklet | grep -v grep | awk '{ system("chrt -f
-p '$TASKLETPR' " $1)}'
echo -n "0000:00:13.0" > /sys/bus/pci/drivers/ohci_hcd/unbind
True. I've set up the netbook to disable all
services and unload all
drivers I don't need when booting with a realtime kernel.
for doing this you simply run a script which figures out the running
kernel with "uname"?
And it
runs
a light DE, rtirq and CPU scaling is set to performance. Also make
sure your audio device isn't sharing an interrupt with something
else. In my case the onboard soundcard shares an interrupt with a USB
controller. I need to unbind the controller otherwise CPU load on the
tasklets will quickly rise.
what do you mean exactly by unbinding the controller? physically
removing it?
cheers,
renato
Best,
Jeremy
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user