From: Phillip Susi <psusi@ubuntu.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
Linux PCI <linux-pci@vger.kernel.org>
Subject: Re: enabling aspm on ati radeon
Date: Tue, 21 May 2013 09:31:37 -0400 [thread overview]
Message-ID: <519B7739.1040909@ubuntu.com> (raw)
In-Reply-To: <11045555.dLhhFPGoSV@vostro.rjw.lan>
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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.
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next prev parent reply other threads:[~2013-05-21 13:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 2:25 enabling aspm on ati radeon Phillip Susi
2013-05-16 8:58 ` Rafael J. Wysocki
2013-05-16 16:42 ` Bjorn Helgaas
[not found] ` <5195596C.3000406@ubuntu.com>
2013-05-17 17:31 ` Bjorn Helgaas
2013-05-17 18:04 ` Phillip Susi
2013-05-17 19:52 ` Bjorn Helgaas
2013-05-17 20:10 ` Phillip Susi
2013-05-17 20:24 ` Bjorn Helgaas
2013-05-17 21:12 ` Phillip Susi
2013-05-17 21:28 ` Bjorn Helgaas
2013-05-17 23:36 ` Phillip Susi
2013-05-17 23:52 ` Bjorn Helgaas
2013-05-18 0:15 ` Phillip Susi
2013-05-18 0:40 ` Bjorn Helgaas
2013-05-18 1:20 ` Phillip Susi
2013-05-20 13:34 ` Bjorn Helgaas
2013-05-20 20:01 ` Rafael J. Wysocki
2013-05-21 13:31 ` Phillip Susi [this message]
2013-05-21 18:50 ` Sebastian
2013-05-24 19:57 ` Phillip Susi
2013-05-24 19:57 ` Phillip Susi
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