From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120]:37382 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753178Ab3EUNbk (ORCPT ); Tue, 21 May 2013 09:31:40 -0400 Message-ID: <519B7739.1040909@ubuntu.com> Date: Tue, 21 May 2013 09:31:37 -0400 From: Phillip Susi MIME-Version: 1.0 To: "Rafael J. Wysocki" CC: Bjorn Helgaas , "linux-acpi@vger.kernel.org" , Linux PCI Subject: Re: enabling aspm on ati radeon References: <519443A1.8050905@ubuntu.com> <5196D765.9020600@ubuntu.com> <11045555.dLhhFPGoSV@vostro.rjw.lan> In-Reply-To: <11045555.dLhhFPGoSV@vostro.rjw.lan> Content-Type: text/plain; charset=UTF-8 Sender: linux-pci-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 5/20/2013 4:01 PM, Rafael J. Wysocki wrote: > I'm pretty sure it's measurable, at least in some cases. Phoronix > did quite some fuss about a commit that caused ASPM to not work any > more on some systems some time ago, so he had to be able to measure > it (and it was called a "major power regression"). That is why I was trying to get it enabled, but the "major regression" seems to be caused by Radeons using the ASPM as a cue to enter low power mode. The energy saved by the bus itself going into the lower power state I can't imagine is more than a few mW. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJRm3c5AAoJEJrBOlT6nu75MkUH/3qGUjM3BmDFjCJ5kJUaMOCg Ps3YFcr37JPumLZNLAwAHeL+eZH1v8G1SkDKPFMfPjIMCY4II4xxthFutV6bslQv PR5w5jjAg/qk0YXEq8CddhdZkVkJw8nKBZiN6jFFcn/c1UgFN39FHCzUTa3sMG2X +rEM4RHzrtcIJm46KXkI162Dzcnj7UaGTFYUzwMCxzy3XHn8xKMS1tfsM1TW3sqS ptcqbsy1rObJewAhdnQZ0pzRgLC7zKWkGlLo00JdFW7wChjsVbM2db++FlpkCT0W sHSSEEYLFqef+fU9FHptJklMx31nF8QHDGh3S277YqTuIaanMufo+gx4vHJC3tM= =tcAW -----END PGP SIGNATURE-----