[LAU] priorities of interrupts or other fixes
Atte André Jensen
atte.jensen at gmail.com
Mon Mar 8 05:31:36 EST 2010
Hi
Normally my ubuntu 9.10 with ubuntu stock kernel performs just fine for
me. I'm running through an edirol FA66 firewire sound card with 8ms latency.
However now I'm starting to prepare for some live performances, and now
things could (or should oar even *must*) perform better.
As some might know, my main audio application is renoise, but since it's
closed source, maybe we should focus more on how the problem manifests
itself in other ways?
Good example: I get two xrun about 2 seconds apart) when I open a
gnome-terminal. This is with no jackclients running, just qjackctl on
8ms latency through the firewire card.
This is normally no problem since if I work in renoise things really
stable (no xruns) and responsive. But for live usage I'm gonna throw
other applications (PD, chuck, sooperlooper) into the equation, so...
About my setup:
Laptop, 2GHz dual core, 2G ram.
atte at vestbjerg:~$ uname -r
2.6.31-20-generic
I have this in my limits.conf:
@audio - rtprio 99
@audio - memlock unlimited
I notice a drastic improvement if I set the frequency govenor to
"performance" through the gnome panel applet, but I just discovered
(through "grep MHz /proc/cpuinfo" that this only seems to set one core
to 2Ghz, the other seems to be running "on demand". Shouldn't they both
be running at full steam, and how do I make them?
But my first thought (as reflected my the subject) was to raise the
priority for the firewire card. However I seem to need help figuring out
how to do that. For instance the last time I did this I used 'pidof "IRQ
8', which doesn't work here (neither on ubuntu repo rt-kernel), pidof
auto completes to this list:
Display all 124 possibilities? (y or n)
0 indicator-users-service
1 init
acpid iwl3945
ata_aux jackd
atd kacpid
avahi-daemon kacpi_hotplug
bash kacpi_notify
bluetooth khelper
bluetooth-applet khpsbpkt
bonobo-activation-server khubd
compiz.real khungtaskd
console-kit-daemon kjournald
cpufreq-applet kmmcd
cpuset kmpath_handlerd
cron knodemgrd_0
cupsd kpsmoused
dbus-daemon krfcommd
dbus-launch kseriod
dd ksnapd
devkit-disks-daemon kstriped
devkit-power-daemon ksuspend_usbd
dhclient kswapd0
ecryptfs-kthrea kthreadd
evolution-alarm-notify mgr
evolution-data-server-2.28 modem-manager
evolution-exchange-storage mono
firefox multiload-applet-2
gconfd-2 nautilus
gdm-binary netns
gdm-session-worker NetworkManager
gdm-simple-slave nm-applet
gdu-notification-daemon notify-osd
getty pdflush
gnome-keyring-daemon phy0
gnome-panel polkitd
gnome-power-manager polkit-gnome-authentication-agent-1
gnome-pty-helper ps
gnome-screensaver pulseaudio
gnome-session python
gnome-settings-daemon qjackctl.bin
gnome-terminal renoise
gnome-volume-control-applet rsyslogd
gtk-window-decorator scsi_eh_0
gvfsd scsi_eh_1
gvfsd-burn scsi_eh_2
gvfsd-metadata scsi_eh_3
gvfsd-trash scsi_eh_4
gvfs-fuse-daemon scsi_eh_5
gvfs-gdu-volume-monitor seahorse-daemon
gvfs-gphoto2-volume-monitor sed
hald sh
My interrupts:
atte at vestbjerg:~$ cat /proc/interrupts
CPU0 CPU1
0: 332326 331479 IO-APIC-edge timer
1: 784 769 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 1064 1081 IO-APIC-fasteoi acpi
12: 75 78 IO-APIC-edge i8042
14: 3590 3577 IO-APIC-edge ata_piix
15: 0 0 IO-APIC-edge ata_piix
16: 118009 118898 IO-APIC-fasteoi uhci_hcd:usb3, ohci1394
17: 0 0 IO-APIC-fasteoi mmc0
18: 7196 7100 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 0 0 IO-APIC-fasteoi uhci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 288 318 IO-APIC-fasteoi HDA Intel
23: 10 10 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
28: 6897 6865 PCI-MSI-edge ahci
29: 957 883 PCI-MSI-edge eth0
30: 6253 6394 PCI-MSI-edge i915
31: 0 0 PCI-MSI-edge iwl3945
NMI: 0 0 Non-maskable interrupts
LOC: 326940 325631 Local timer interrupts
SPU: 0 0 Spurious interrupts
CNT: 0 0 Performance counter interrupts
PND: 0 0 Performance pending work
RES: 265237 265761 Rescheduling interrupts
CAL: 60 111 Function call interrupts
TLB: 422 295 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 2 3 Machine check polls
ERR: 0
MIS: 0
About my hardware:
atte at vestbjerg:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory
Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 4 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface
Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E)
IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E)
SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller
(rev 03)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 01)
04:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection (rev 02)
0a:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
(rev 05)
0a:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro
Host Adapter (rev 22)
0a:01.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
0a:01.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host
Adapter (rev 12)
0a:01.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff)
So basically I'm a bit lost here. Any help or input would be greatly
appreciated!
--
Atte
http://atte.dk http://modlys.dk
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