On 11/03/2012 10:05 PM, Ralf Mardorf wrote:
On Sat, 3 Nov 2012 08:43:11 -0700
"Len Ovens" <len@xxxxxxxxxxxxx> 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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