Re: [LAU] 1. Linux-Rt and TSC - 2. Linux-Rt and IRQ allocation

On Wed, 2014-01-22 at 18:56 +0100, Clemens Ladisch wrote:
> > 2. Linux-Rt and IRQ allocation
> > ==============================
> >
> > All kernels I used in the last years for *buntu, Debian and Arch Linux
> > <= 3.8.13-rt14 (kernels > 3.8.13-rt14 don't work on my machine) give my
> > graphics it's own IRQ, the Debian kernel 3.2.0-4-rt-686-pae doesn't.
>
> What is difference in /proc/interrupts?

Hi Clemens,

Im not absolutely sure if the 3.2 kernels already gave the graphics it's
own IRQ on my machine, when I used them a long time ago, but AFAIR those
kernels already did, at least the IRQ was displayed by commands that
should show the IRQ, but now something is fishy.

The graphics even isn't listed in /proc/interrupts for the Debian
3.2.0-4-rt-686-pae. Today I build a 3.8.13-rt14-pae kernel that is ok.

rocketmouse@email-addr-hidden:~$ uname -a
Linux debi386 3.8.13-rt14-pae-rocketmouse-2 #1 SMP PREEMPT RT Mon Jan 27 15:47:47 CET 2014 i686 GNU/Linux
rocketmouse@email-addr-hidden:~$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   39 FF 90 - 130 0.0 S irq/8-rtc0
  644 FF 85 - 125 0.0 S irq/18-snd_hdsp
  646 FF 80 - 120 0.0 S irq/20-snd_ice1
  650 FF 79 - 119 0.0 S irq/21-snd_ice1
  631 FF 75 - 115 0.0 S irq/19-ehci_hcd
  632 FF 75 - 115 0.0 S irq/16-ohci_hcd
  634 FF 74 - 114 0.5 S irq/17-ohci_hcd
  649 FF 73 - 113 0.2 S irq/17-ohci_hcd
   38 FF 70 - 110 0.0 S irq/1-i8042
   27 FF 50 - 90 0.0 S irq/9-acpi
  126 FF 50 - 90 0.6 S irq/22-ahci
  569 FF 50 - 90 0.0 S irq/7-parport0
  621 FF 50 - 90 0.0 S irq/22-firewire
  623 FF 50 - 90 0.0 S irq/43-radeon
  625 FF 50 - 90 0.0 S irq/14-pata_ati
  626 FF 50 - 90 0.0 S irq/15-pata_ati
  642 FF 50 - 90 0.0 S irq/18-ohci_hcd
  651 FF 50 - 90 0.0 S irq/18-ohci_hcd
 1883 FF 50 - 90 0.0 S irq/42-eth0
    3 FF 1 - 41 0.1 S ksoftirqd/0
   15 FF 1 - 41 0.2 S ksoftirqd/1

rocketmouse@email-addr-hidden:~$ ls /proc/irq/* | grep radeon
radeon
rocketmouse@email-addr-hidden:~$ ls /proc/irq/43 | grep radeon
radeon
rocketmouse@email-addr-hidden:~$ sudo lshw -c video | grep irq
resources: irq:43 memory:d0000000-dfffffff memory:fdff0000-fdffffff ioport:ce00(size=256) memory:fde00000-fdefffff

rocketmouse@email-addr-hidden:~$ uname -a
Linux debi386 3.2.0-4-rt-686-pae #1 SMP PREEMPT RT Debian 3.2.51-1 i686 GNU/Linux
rocketmouse@email-addr-hidden:~$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   36 FF 90 - 130 0.0 S irq/8-rtc0
  623 FF 85 - 125 0.0 S irq/18-snd_hdsp
  634 FF 80 - 120 0.0 S irq/20-snd_ice1
  638 FF 79 - 119 0.0 S irq/21-snd_ice1
  560 FF 75 - 115 0.0 S irq/19-ehci_hcd
  569 FF 75 - 115 0.0 S irq/16-ohci_hcd
  570 FF 74 - 114 0.0 S irq/17-ohci_hcd
  586 FF 73 - 113 0.0 S irq/17-ohci_hcd
   34 FF 70 - 110 0.0 S irq/1-i8042
   24 FF 50 - 90 0.0 S irq/9-acpi
  129 FF 50 - 90 0.3 S irq/22-ahci
  561 FF 50 - 90 0.0 S irq/22-firewire
  565 FF 50 - 90 0.0 S irq/14-pata_ati
  566 FF 50 - 90 0.0 S irq/15-pata_ati
  574 FF 50 - 90 0.0 S irq/18-ohci_hcd
  593 FF 50 - 90 0.0 S irq/7-parport0
  594 FF 50 - 90 0.0 S irq/18-ohci_hcd
 1855 FF 50 - 90 0.0 S irq/42-eth0
    3 FF 1 - 41 0.1 S ksoftirqd/0
   13 FF 1 - 41 0.1 S ksoftirqd/1

rocketmouse@email-addr-hidden:~$ ls /proc/irq/* | grep radeon
rocketmouse@email-addr-hidden:~$ sudo lshw -c video | grep irq
resources: irq:18 memory:d0000000-dfffffff memory:fdff0000-fdffffff ioport:ce00(size=256) memory:fde00000-fdefffff

Regards,
Ralf

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Received on Mon Jan 27 20:15:04 2014