linuxaudio.org

On 11/03/2012 10:05 PM, Ralf Mardorf wrote:

quoted text
> On Sat, 3 Nov 2012 08:43:11 -0700

> "Len Ovens"  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
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