On Tue, Jul 09, 2013 at 11:49:06AM +0200, Pavel Machek wrote: > On Mon 2013-07-08 21:13:21, Greg KH wrote: > > On Tue, Jul 09, 2013 at 03:26:11AM +0200, Pavel Machek wrote: > > > Hi! > > > > > > My thinkpad has rather high ping latencies... and perhaps it is due to > > > PCIE ASPM. > > > > Why would that be the problem? The odds that the PCIE bus is the issue > > seems strange to me. > > Aha: I guess that's why the file is not writable: > > pavel@amd:~$ dmesg | grep -i aspm > ACPI FADT declares the system doesn't support PCIe ASPM, so disable it > e1000e 0000:02:00.0: Disabling ASPM L0s L1 > pavel@amd:~$ cat /sys/module/pcie_aspm/parameters/policy > [default] performance powersave > pavel@amd:~$ > root@amd:~# echo -n performance > > /sys/module/pcie_aspm/parameters/policy > -su: echo: write error: Operation not permitted > root@amd:~# > > But: > 1) it should not list unavailable options
It's a module parameter, you can't control if they are present or not dynamically. > 2) operation not permitted seems like wrong error code for > operation not supported. Then what should it be? greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
