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

On 11/03/2012 10:05 PM, Ralf Mardorf wrote:
> On Sat, 3 Nov 2012 08:43:11 -0700
> "Len Ovens" <len@email-addr-hidden> wrote:
>
>> Playing with PCI_latency made things worse for me, no gain and an
>> unstable machine. This will have no effect whatever on PCIe cards.
>
> Okay, so I only will unbind 2 USB ports. FWIW some things need to be
> done in a different way, than it's described by "linuxmusicians" and
> stopping networking does cause trouble. I couldn't find out how to
> unbind the 2 USB ports.
>

Now you've got:

echo -n "0000:00/0000:00:13.2" > /sys/bus/pci/drivers/ohci_hcd/unbind
echo -n "0000:00/0000:00:13.4" > /sys/bus/pci/drivers/ohci_hcd/unbind

Which yields:

> tuning: line 28: echo: write error: No such device
> tuning: line 29: echo: write error: No such device

Maybe you could try:

echo -n "0000:00:13.2" > /sys/bus/pci/drivers/ohci_hcd/unbind
echo -n "0000:00:13.4" > /sys/bus/pci/drivers/ohci_hcd/unbind

You should also check which driver the USB ports are using, ohci, ehci
or uhci. You can check this with cat /proc/interrupts | grep usb for
instance:

cat /proc/interrupts | grep usb
  16: 39179 307 IO-APIC-fasteoi uhci_hcd:usb3, mmc0,
firewire_ohci, jmb38x_ms:slot0, eth1, nvidia
  17: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
  18: 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
  19: 0 0 IO-APIC-fasteoi uhci_hcd:usb8
  20: 9 9 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
  22: 0 0 IO-APIC-fasteoi uhci_hcd:usb6

As you can see the bus ID's get prepended with ohci_hcd, ehci_hcd or
uhci_hcd. So you have to write your bus ID's to the corresponding unbind
file. In your case the one in /sys/bus/pci/drivers/ohci_hcd/.

Regards,

Jeremy

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-user
Received on Sun Nov 4 16:15:01 2012