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Message-ID: <20130709094906.GA3870@amd.pavel.ucw.cz> Date: Tue, 9 Jul 2013 11:49:06 +0200 From: Pavel Machek <pavel@....cz> To: Greg KH <greg@...ah.com> Cc: kernel list <linux-kernel@...r.kernel.org>, joe.lawrence@...atus.com, myron.stowe@...hat.com, bhelgaas@...gle.com Subject: Re: /sys/module/pcie_aspm/parameters/policy not writable? 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 2) operation not permitted seems like wrong error code for operation not supported. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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