Date: Wed, 10 Dec 2003 10:04:51 -0800 (PST) From: Nate Lawson <nate@root.org> To: John Baldwin <jhb@FreeBSD.org> Cc: current@freebsd.org Subject: RE: ACPI throttling changes Message-ID: <20031210100342.B46577@root.org> In-Reply-To: <XFMail.20031210114404.jhb@FreeBSD.org> References: <XFMail.20031210114404.jhb@FreeBSD.org>
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On Wed, 10 Dec 2003, John Baldwin wrote: > On 10-Dec-2003 Nate Lawson wrote: > > I'm working on a shared CPU frequency control driver. One step is to > > remove some of the autonomy of the throttling portion of acpi_cpu. > > Please test this patch if you have a machine which supports throttling. > > With this patch, throttling can be changed by doing: > > > > sysctl hw.acpi.cpu.current_speed=X > > > > where X is some number between 1 and hw.acpi.cpu.max_speed. It is no > > longer driven by AC line transitions. Run a CPU benchmark like this one > > to make sure the throttling transition still works with this patch. > > > > dd if=/dev/zero bs=1m count=500 | md5 > > > > This is part of a larger work. Don't worry, it won't be committed until > > general CPU frequency control is done so no loss of functionality will be > > committed. > > We need to support using throttling for passive cooling btw. My new laptop > I just got has no active cooling support, but does have _TC1 and _TC2 objects > in its thermal zone. Are you going to add that? Eventually. The first step is to get a general frequency control driver working. It will also do throttling as well as speedstep, longrun, etc. The step after that is to change acpi_thermal to use that driver for passive cooling. -Nate
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