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Dominique_71
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Joined: 17 Aug 2005
Posts: 1877
Location: Switzerland (Romandie)
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 Posted: Wed Jan 25, 2006 6:14 pm Post subject: |
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After reading /usr/src/linux/Documentation/sound/alsa/emu10k1-jack.txt and according my jack config as suggested, I am now able to run jack with a latency of 1.33msec at 48kHz and 0.667 msec at 96kHz. Its rock!
Here is some scripts I run at boot time:
/etc/init.d/realtime
| Code: | #! /bin/sh
#
# This script loads and unloads the realtime kernel module
# Configuration can be put into /etc/default/realtime
#
# Author: Guenter Geiger <geiger@debian.org>
#
#
# Version: 0.1
#
PATH=/sbin:/bin:/usr/sbin:/usr/bin
NAME=realtime
DESC="Realtime Linux Security Module"
# Gracefully exit if the package has been removed.
if test ! -e "/lib/modules/`uname -r`/extra/realtime.ko"
then
echo Loading $DESC: not found
exit 0
fi
# Read config file if it is present.
[ -r /etc/default/$NAME ] && . /etc/default/$NAME
# The module has to be enabled
if test "$ENABLE" != "yes"
then
echo Loading $DESC: disabled
exit 0
fi
CAPLOADED=`lsmod | grep capability`
set -e
case "$1" in
start)
if [ "$CAPLOADED" != "" ]
then
echo Realtime Linux Security Module: Unloading capability LSM
rmmod capability
fi
echo -n "Loading $DESC: $NAME"
modprobe $NAME $PARAMETERS
echo "."
;;
stop)
echo -n "Unloading $DESC: $NAME "
modprobe -r $NAME
echo "."
;;
restart|force-reload)
echo -n "Restarting $DESC: $NAME"
modprobe -r $NAME
sleep 1
modprobe $NAME $PARAMETERS
echo "."
;;
*)
N=/etc/init.d/$NAME
# echo "Usage: $N {start|stop|restart|reload|force-reload}" >&2
echo "Usage: $N {start|stop|restart|force-reload}" >&2
exit 1
;;
esac
exit 0
|
/etc/init.d/rtirq
| Code: | #!/bin/sh
#
# Copyright (c) 2004-2005 rncbc aka Rui Nuno Capela.
# All rights reserved.
#
# /etc/init.d/rtirq
#
# Startup script for realtime-preempt enabled kernels.
#
# chkconfig: 35 81 19
# description: Realtime IRQ thread tunning.
#
### BEGIN INIT INFO
# Provides: rtirq
# Required-Start: $syslog $local_fs
# Should-Start: $time alsa alsasound hotplug
# Required-Stop: $syslog $local_fs
# Should-Stop: $time alsa alsasound hotplug
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Short-Description: Realtime IRQ thread tunning.
# Description: Change the realtime scheduling policy
# and priority of relevant system driver IRQ handlers.
### END INIT INFO
#
# Won't work without those binaries.
for DIR in /sbin /usr/sbin /bin /usr/bin /usr/local/bin; do
[ -z "${RTIRQ_CHRT}" -a -x ${DIR}/chrt ] && RTIRQ_CHRT=${DIR}/chrt
[ -z "${RTIRQ_PIDOF}" -a -x ${DIR}/pidof ] && RTIRQ_PIDOF=${DIR}/pidof
done
# Check for missing binaries (stale symlinks should not happen)
[ -n "${RTIRQ_CHRT}" -a -x ${RTIRQ_CHRT} ] || {
echo "`basename $0`: chrt: not installed."
[ "$1" = "stop" ] && exit 0 || exit 5
}
[ -n "${RTIRQ_PIDOF}" -a -x ${RTIRQ_PIDOF} ] || {
echo "`basename $0`: pidof: not installed."
[ "$1" = "stop" ] && exit 0 || exit 5
}
# Check for existence of needed config file and read it.
RTIRQ_CONFIG=/etc/default/rtirq
[ -r ${RTIRQ_CONFIG} ] || {
echo "`basename $0`: ${RTIRQ_CONFIG}: not found."
[ "${RTIRQ_ACTION}" = "stop" ] && exit 0 || exit 6
}
# Read configuration.
. ${RTIRQ_CONFIG}
# Colon delimited trail list of already assigned IRQ numbers,
# preventind lower priority override due to shared IRQs.
RTIRQ_TRAIL=":"
#
# Reset policy of all IRQ threads out there.
#
function rtirq_reset ()
{
# PIDS=`ps -eo pid,class | egrep '(FF|RR)' | awk '{print $1}'`
PIDS=`ps -eo pid,comm | grep IRQ | awk '{print $1}'`
for PID in ${PIDS}
do
${RTIRQ_CHRT} --pid --other 0 ${PID}
done
}
#
# IRQ thread handler policy prioritizer by number.
#
function rtirq_exec_num ()
{
ACTION=$1
NAME=$2
PRI2=$3
IRQ=$4
PID=`${RTIRQ_PIDOF} "IRQ ${IRQ}"`
if [ $((${PID})) -gt 0 -a -z "`echo ${RTIRQ_TRAIL} | grep :${IRQ}:`" ]
then
PREPEND="Setting IRQ priorities: ${ACTION} [${NAME}] irq=${IRQ} pid=${PID}"
case ${ACTION} in
start)
PREPEND="${PREPEND} prio=${PRI2}"
if ${RTIRQ_CHRT} --pid --fifo ${PRI2} ${PID}
then
echo "${PREPEND}: OK."
else
echo "${PREPEND}: FAILED."
fi
;;
stop)
if ${RTIRQ_CHRT} --pid --other 0 ${PID}
then
echo "${PREPEND}: OK."
else
echo "${PREPEND}: FAILED."
fi
;;
status)
echo "${PREPEND}: " && ${RTIRQ_CHRT} --pid --verbose ${PID}
;;
*)
echo "${PREPEND}: ERROR."
;;
esac
RTIRQ_TRAIL=":${IRQ}${RTIRQ_TRAIL}"
fi
}
#
# IRQ thread handler policy prioritizer by name.
#
function rtirq_exec_name ()
{
ACTION=$1
NAME=$2
PRI1=$3
IRQS=`grep "${NAME}" /proc/interrupts | awk -F: '{print $1}'`
for IRQ in ${IRQS}
do
rtirq_exec_num ${ACTION} ${NAME} ${PRI1} ${IRQ}
PRI1=$((${PRI1} - 1))
done
}
#
# Main executive.
#
function rtirq_exec ()
{
ACTION=$1
# Check configured base priority.
PRI0=${RTIRQ_PRIO_HIGH}
[ $((${PRI0})) -gt 90 ] && PRI0=90
[ $((${PRI0})) -lt 10 ] && PRI0=10
# Check configured priority decrease step.
DECR=${RTIRQ_PRIO_DECR}
[ $((${DECR})) -gt 20 ] && DECR=20
[ $((${DECR})) -lt 1 ] && DECR=1
# Process all configured service names...
for NAME in ${RTIRQ_NAME_LIST}
do
case ${NAME} in
snd)
PRI1=${PRI0}
IRQS=`grep irq /proc/asound/cards | sed 's/.* irq \(.*\)/\1/'`
for IRQ in ${IRQS}
do
rtirq_exec_num ${ACTION} ${NAME} ${PRI1} ${IRQ}
PRI1=$((${PRI1} - 1))
done
;;
usb)
rtirq_exec_name ${ACTION} "ohci_hcd" ${PRI0}
rtirq_exec_name ${ACTION} "uhci_hcd" ${PRI0}
rtirq_exec_name ${ACTION} "ehci_hcd" ${PRI0}
;;
*)
rtirq_exec_name ${ACTION} ${NAME} ${PRI0}
;;
esac
[ ${PRI0} -gt ${DECR} ] && PRI0=$((${PRI0} - ${DECR}))
done
}
#
# Main procedure line.
#
case $1 in
*start)
if [ "${RTIRQ_RESET_ALL}" = "yes" -o "${RTIRQ_RESET_ALL}" = "1" ]
then
rtirq_reset
fi
rtirq_exec start
;;
stop)
if [ "${RTIRQ_RESET_ALL}" = "yes" -o "${RTIRQ_RESET_ALL}" = "1" ]
then
rtirq_reset
#else
# rtirq_exec stop
fi
;;
reset)
if [ "${RTIRQ_RESET_ALL}" = "yes" -o "${RTIRQ_RESET_ALL}" = "1" ]
then
rtirq_reset
else
rtirq_exec stop
fi
;;
status)
echo
#rtirq_exec status
ps -eo pid,class,rtprio,ni,pri,pcpu,stat,comm --sort -rtprio \
| egrep '(^[[:blank:]]*PID|IRQ)' \
| awk 'BEGIN {
while (getline IRQLine < "/proc/interrupts") {
split(IRQLine, IRQSplit, ":");
if (match(IRQSplit[1], "^[[:blank:]]+[0-9]+$")) {
gsub("^[[:blank:]|0-9]+|[/|0-9]+$" \
"|[^[:blank:]]+PIC[^[:blank:]]*[[:blank:]]+", \
"", IRQSplit[2]);
IRQTable[IRQSplit[1] + 0] = IRQSplit[2];
}
}
} { print $0"\t"IRQTable[$9]; }'
echo
;;
*)
echo
echo " Usage: $0 {[re]start|stop|reset|status}"
echo
exit 1
;;
esac
exit 0
|
/etc/default/realtime
| Code: | # Configuration file for the realtime LSM module
# PARAMETERS can be one or more of:
#
# gid=xx (allow realtime capabilities for gid xx only)
# any=1|0 (allow any user and process to have realtime)
# mlock=1|0 (allow/disallow mlocking)
# allcaps=1|0 (allow setpcap functionality (dangerous!))
# enable loading of module at startup
ENABLE=yes
# parameter settings for module
PARAMETERS="gid=18"
|
/etc/default/rtirq
| Code: | #!/bin/sh
#
# Copyright (c) 2004-2005 rncbc aka Rui Nuno Capela.
# All rights reserved.
#
# /etc/default/rtirq
#
# Configuration for IRQ thread tunning,
# for realtime-preempt enabled kernels,
#
# IRQ Thread service names
# (space separeted list, from higher to lower priority).
RTIRQ_NAME_LIST="rtc snd usb i8042"
# Highest priority.
RTIRQ_PRIO_HIGH=90
# Priority decrease step.
RTIRQ_PRIO_DECR=10
# Whether to reset all IRQ threads to SCHED_OTHER.
RTIRQ_RESET_ALL=0
|
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evermind
Guru
Joined: 10 Jan 2004
Posts: 322
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| Posted: Thu Feb 16, 2006 7:57 pm Post subject: |
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| Dominique_71 wrote: |
/etc/init.d/rtirq
|
I added an ebuild to my pro_audio_music_portage_overlay for the rtirq-init-script
and adjusted it a bit to match the gentoo-init-style -- hope nothing broke
thx for the hint
original script was: mailinglist: PlanetCCRMA |
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Dominique_71
Veteran
Joined: 17 Aug 2005
Posts: 1877
Location: Switzerland (Romandie)
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| Posted: Sat Feb 18, 2006 3:37 pm Post subject: |
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You are welcome.
The kernel development is going very fast, and the realtime-lsm module is now obsolete.
The future will be a PAM realtime kernel with rt-limit, but I believe at it is best to wait until the rt-limit has proved at it is as reliable as the realtime-lsm. 
alsa and PAM
Rlimits-Aware PAM
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josh
Guru
Joined: 05 Feb 2003
Posts: 473
Location: Milky Way: Solar System: Earth: North America: USA: NY: Buffalo
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| Posted: Fri Mar 17, 2006 1:49 am Post subject: |
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Just wanted to say that those init scripts are awesome!
I had to test it out of course. I did an 'emerge sync' and opened up firefox, openoffice, limewire and some other heavily hitters. The load went through the roof and the CPU usage for X went up to about 80 or 90 and the desktop became pretty unresponsive in general. But I could play a few songs and record in ardour without incident! And this is on my p3! I can't wait to see how many tracks I can stack on now.
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Dominique_71
Veteran
Joined: 17 Aug 2005
Posts: 1877
Location: Switzerland (Romandie)
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| Posted: Fri Apr 14, 2006 8:45 pm Post subject: |
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The 2 files /etc/init.d/realtime and /etc/default/realtime are not needed on gentoo. It is enough to edit /etc/modules.autoload.d/kernel-2.6 <-- add realtime there
and /etc/modules.d/realtime | Code: | | options realtime gid=18 |
We get no boot message, but the result is the same.
You will get the last file when emerging realtime-lsm, but not if you are installing this module with the rt-sources on evermind's audio-pro overlay. It is of course my favorite gentoo overlay and I recommand to install it.
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