linuxaudio.org

On 03/08/2010 11:31 AM, Atte André Jensen wrote:

quoted text
> 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@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@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@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!

> 

Hello Atte,
Best is to disable frequency scaling altogether. Or add more CPU

frequency monitors to your panel, one for each core. And you could take

a look at rtirq: http://ubuntuforums.org/showthread.php?t=1328175

And the FFADO wiki: http://subversion.ffado.org/wiki/IrqPriorities

This improved performance on all my machines drastically, especially

with my Focusrite Saffire Pro.
Best,
Jeremy

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