11 Jul
2010
11 Jul
'10
7:31 p.m.
On Sun, 2010-07-11 at 18:07 +0200, Robin Gareus wrote:
The whole output of 'ps -eo...' will be
tooooooo long. Just have a look
and check for high priority processes that are different on both systems.
If you have rtirq installed: '/etc/init.d/rtirq status' will show the
same list but only display processes with RTPRIO set.
Oh and I missed that the Ubuntu's 2.6.32.XX is actually not a rt-preemt
kernel. many thanks to Arnout to spot that.
If there's still a difference between SuSe & Ubuntu using the identical
kernel, with no significant high-priority processes: please post the
version of the alsa-libs for both systems.
Not sure if it has been mentioned before, but you should set your
soundcard's IRQ handler priority to sth "high" (eg 90) and use '-P
89'
with alsa-midi-latency-test.
With the default of "-P 99" the kernel will always end up inverting
priorities to run it (the overhead for doing so is low but it may still
be relevant).
Thanks for being persistent on the Midi Jitter issue. Some of that info
is bound to come in handy..
ciao,
robin
When I booted Ubuntustudio I didn't get this mail, so here is what I did
before I read your mail.
The blame is on Ubuntustudio.
Ubuntustudio by default isn't able to do rt! Changing the defaults seems
to be not that easy!
What an odd distro!
I did check the md5sum for the Ubuntustudio ISO and K3b did verify the
burned DVD, everything was ok.
########################################################################
openSUSE 11.2
########################################################################
suse11-2:/media/ubuntu_s_home/spinymouse/Desktop # cat /proc/interrupts
suse_proc_irqs.txt
suse11-2:/media/ubuntu_s_home/spinymouse/Desktop # ps ax | wc -l
186
suse11-2:/media/ubuntu_s_home/spinymouse/Desktop # ps -eo
pid,class,rtprio,ni,pri,pcpu,stat,comm --sort -rtprio >
suse_job_prio.txt
########################################################################
Ubuntu Studio 10.04
########################################################################
1.
For Ubuntu Studio by default frequency scaling isn't performance.
Fortunately 'cpufreq-selector -g performance' does the job, but it must
be finished by Ctrl + C.
2.
If I try to boot kernel 2.6.31-11-rt or kernel 2.6.31-10-rt from the
repositories I get
'mount: mounting none on /dev failed: No such device.' Regading to the
web this might be, because of CONFIG_DEVTMPFS.
3.
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
3 FF 99 - 139 0.0 S< migration/0
13 FF 99 - 139 0.0 S< posixcputmr/0
14 FF 99 - 139 0.0 S< watchdog/0
16 FF 99 - 139 0.0 S< migration/1
17 FF 99 - 139 0.0 S< posixcputmr/1
27 FF 99 - 139 0.0 S< watchdog/1
83 FF 90 - 130 0.0 S< irq/8-rtc0
655 FF 85 - 125 0.0 S< irq/21-ICE1712
653 FF 84 - 124 0.0 S< irq/20-ICE1712
for Suse vs
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
3 FF 99 - 139 0.0 S migration/0
5 FF 99 - 139 0.0 S watchdog/0
6 FF 99 - 139 0.0 S migration/1
8 FF 99 - 139 0.0 S watchdog/1
1 TS - [...]
for Ubuntu.
root@ubuntu:~# hwinfo --cpu
Model: 15.107.2 "AMD Athlon(tm) X2 Dual Core Processor BE-2350"
Clock: 1000 MHz
root@ubuntu:~# cpufreq-selector -g performance
^C
root@ubuntu:~# hwinfo --cpu
Model: 15.107.2 "AMD Athlon(tm) X2 Dual Core Processor BE-2350"
Clock: 2100 MHz
root@ubuntu:~# ps ax | wc -l
152
root@ubuntu:~# cd /home/spinymouse/Desktop
root@ubuntu:/home/spinymouse/Desktop# cat /proc/interrupts >
ubuntustudio_proc_irqs.txt
root@ubuntu:/home/spinymouse/Desktop# ps ax | wc -l
151
root@ubuntu:/home/spinymouse/Desktop# ps ax | wc -l
151
root@ubuntu:/home/spinymouse/Desktop# ps -eo
pid,class,rtprio,ni,pri,pcpu,stat,comm --sort -rtprio >
ubuntustudio_job_prio.txt
root@ubuntu:/home/spinymouse/Desktop# cat /boot/grub/grub.cfg
menuentry 'Ubuntu, with Linux 2.6.32-23-preempt' --class ubuntu --class
gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd1,11)'
search --no-floppy --fs-uuid --set 54b5bb8c-356a-4268-8592-e76aac7941a8
linux /boot/vmlinuz-2.6.32-23-preempt
root=UUID=54b5bb8c-356a-4268-8592-e76aac7941a8 ro quiet splash
initrd /boot/initrd.img-2.6.32-23-preempt
}
menuentry 'Ubuntu, with Linux 2.6.32-21-preempt' --class ubuntu --class
gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd1,11)'
search --no-floppy --fs-uuid --set 54b5bb8c-356a-4268-8592-e76aac7941a8
linux /boot/vmlinuz-2.6.32-21-preempt
root=UUID=54b5bb8c-356a-4268-8592-e76aac7941a8 ro quiet splash
initrd /boot/initrd.img-2.6.32-21-preempt
}
menuentry 'Ubuntu, with Linux 2.6.31-11-rt' --class ubuntu --class
gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd1,11)'
search --no-floppy --fs-uuid --set 54b5bb8c-356a-4268-8592-e76aac7941a8
linux /boot/vmlinuz-2.6.31-11-rt
root=UUID=54b5bb8c-356a-4268-8592-e76aac7941a8 ro quiet splash
initrd /boot/initrd.img-2.6.31-11-rt
}
menuentry 'Ubuntu, with Linux 2.6.31-10-rt' --class ubuntu --class
gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd1,11)'
search --no-floppy --fs-uuid --set 54b5bb8c-356a-4268-8592-e76aac7941a8
linux /boot/vmlinuz-2.6.31-10-rt
root=UUID=54b5bb8c-356a-4268-8592-e76aac7941a8 ro quiet splash
initrd /boot/initrd.img-2.6.31-10-rt
root@ubuntu:/home/spinymouse/Desktop# uname -a
Linux ubuntu 2.6.32-23-preempt #37-Ubuntu SMP PREEMPT Fri Jun 11
10:19:07 UTC 2010 x86_64 GNU/Linux
root@ubuntu:/home/spinymouse/Desktop# hwinfo --gfxcard
Driver: "nouveau"
Driver Modules: "drm"
IRQ: 18 (4 events)
root@ubuntu:/home/spinymouse/Desktop# groups spinymouse
spinymouse : spinymouse adm dialout cdrom audio src plugdev lpadmin
admin sambashare
root@ubuntu:/home/spinymouse/Desktop#
cat /etc/security/limits.d/audio.conf
# generated by jackd's postinst.
#
# Do not edit this file by hand, use
#
# dpkg-reconfigure -p high jackd
#
# instead.
@audio - rtprio 99
@audio - memlock unlimited
#@audio - nice -19
The installed rtirq-init is 20090920-0ubuntu1.
root@ubuntu:/home/spinymouse/Desktop# cd /boot
root@ubuntu:/boot# ls
abi-2.6.31-10-rt config-2.6.32-21-preempt
initrd.img-2.6.32-23-preempt vmcoreinfo-2.6.31-10-rt
vmlinuz-2.6.32-21-preempt
abi-2.6.31-11-rt config-2.6.32-23-preempt memtest86+.bin
vmcoreinfo-2.6.31-11-rt vmlinuz-2.6.32-23-preempt
abi-2.6.32-21-preempt grub
System.map-2.6.31-10-rt vmcoreinfo-2.6.32-21-preempt
abi-2.6.32-23-preempt initrd.img-2.6.31-10-rt
System.map-2.6.31-11-rt vmcoreinfo-2.6.32-23-preempt
config-2.6.31-10-rt initrd.img-2.6.31-11-rt
System.map-2.6.32-21-preempt vmlinuz-2.6.31-10-rt
config-2.6.31-11-rt initrd.img-2.6.32-21-preempt
System.map-2.6.32-23-preempt vmlinuz-2.6.31-11-rt
root@ubuntu:/boot# cat config-2.6.31-11-rt | grep CONFIG_DEVTMPFS
root@ubuntu:/boot# cat config-2.6.32-23-preempt | grep CONFIG_DEVTMPFS
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y