Re: [LAU] Something interesting about kernel 3.6.5-rt14

On Sat, 03 Nov 2012 11:32:21 +0100
Florian Paul Schmidt <mista.tapas@email-addr-hidden> wrote:

> On 11/03/2012 10:40 AM, Ralf Mardorf wrote:
> > I noticed something interesting about kernel 3.6.5-rt14.
>
> [..]
>
> > Unfortunately it didn't solve xrun issues for the RME card. However,
> > the kernel does switch to another IRQ for the graphics, for all
> > other kernels on different distros, the graphics always gets IRQ18,
> > also if I switch the integrated ATI with a Nvidia.
> >
>
> Hi, this is a long shot, but you might play around with the PCI bus
> latency settings for different devices.. I.e. turn them down from the
> default value and see if it helps at all. I'm no expert in this, so
> make sure to read up on the subject.
>
> http://www.mythtv.org/wiki/PCI_Latency
>
> Maybe some device (most probably a GPU or a NIC) holds on to the PCI
> bus for too long..
>
> Flo

Thank you Flo :)

if I remove all USB stuff I still see irq/18-ohci_hcd [1].

Regards,
Ralf

[1]
$ top

2583 spinymou 20 0 1155m 310m 107m S 9.3 8.4 3:09.87
 qtractor
2827 spinymou 20 0 392m 47m 21m S 1.7 1.3 0:05.03
 plugin-containe
2562 spinymou 20 0 275m 89m 82m S 1.3 2.4 0:27.17
 jackd
15 root -2 0 0 0 0 S 1.0 0.0 0:04.39
 ksoftirqd/1
1264 root 20 0 150m 36m 14m S 1.0 1.0 1:05.48
 Xorg
2577 spinymou 20 0 536m 110m 100m S 1.0 3.0 0:10.23
 qjackctl.real
2785 spinymou 20 0 922m 139m 43m S 0.7 3.8 0:37.66
 firefox
58 root -79 0 0 0 0 S 0.3 0.0 0:02.06
 irq/18-ohci_hcd
60 root -78 0 0 0 0 S 0.3 0.0 0:03.43
 irq/18-ohci_hcd
849 root -86 0 0 0 0 S 0.3 0.0 0:05.95
 irq/18-snd_hdsp
2159 spinymou 20 0 163m 14m 9m S 0.3 0.4 0:08.91
 panel-25-weathe
2487 spinymou 20 0 476m 18m 13m S 0.3 0.5 0:04.61
 xfce4-terminal
1 root 20 0 24432 2320 1272 S 0.0 0.1 0:01.27
init

spinymouse@email-addr-hidden:~$ cat /proc/interrupts | grep 18
 18: 0 752885 IO-APIC-fasteoi ohci_hcd:usb4,
                             ohci_hcd:usb6, snd_hdspm

spinymouse@email-addr-hidden:~$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   62 FF 90 - 130 0.0 S irq/8-rtc0
  849 FF 85 - 125 0.1 S irq/18-snd_hdsp
  908 FF 85 - 125 0.0 S irq/20-snd_ice1
  911 FF 85 - 125 0.0 S irq/21-snd_ice1
   54 FF 80 - 120 0.0 S irq/19-ehci_hcd
   55 FF 80 - 120 0.0 S irq/16-ohci_hcd
   56 FF 79 - 119 0.0 S irq/17-ohci_hcd
   58 FF 78 - 118 0.0 S irq/18-ohci_hcd
   59 FF 78 - 118 0.0 S irq/17-ohci_hcd
   60 FF 77 - 117 0.0 S irq/18-ohci_hcd
   61 FF 75 - 115 0.0 S irq/1-i8042
   24 FF 50 - 90 0.0 S irq/9-acpi
   46 FF 50 - 90 0.0 S irq/22-ahci
  214 FF 50 - 90 0.0 S irq/14-pata_ati
  215 FF 50 - 90 0.0 S irq/15-pata_ati
  301 FF 50 - 90 0.0 S irq/22-firewire
  720 FF 50 - 90 0.0 S irq/7-parport0
  727 FF 50 - 90 0.0 S irq/43-radeon
 1111 FF 50 - 90 0.0 S irq/42-eth0
    3 FF 1 - 41 0.3 S ksoftirqd/0
   15 FF 1 - 41 0.1 S ksoftirqd/1
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Received on Sat Nov 3 16:15:03 2012