Date: Fri, 27 Jun 2008 16:27:03 +0100 From: David Wood <david@wood2.org.uk> To: David Wood <david@wood2.org.uk> Cc: freebsd-acpi@freebsd.org Subject: Re: Dell PowerEdge 2950 III - CPU power management problems Message-ID: <vAaAu6EHbQZIFAHd@wood2.org.uk> In-Reply-To: <YnwmlzIfBaQIFAqP@wood2.org.uk> References: <YnwmlzIfBaQIFAqP@wood2.org.uk>
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Dear all, In message <YnwmlzIfBaQIFAqP@wood2.org.uk>, David Wood <david@wood2.org.uk> writes >I'm having problems with CPU power management on a Dell PowerEdge 2950 >III. > >I've posted this to freebsd-acpi in the first instance - though it may >finish up belonging on freebsd-stable. As I am almost certain there are >bugs in teh DSDT, I thought I'd start on freebsd-acpi. Dell have just shipped the 2.3.1 BIOS for this hardware, which fixes the DSDT bugs. If I have correctly understood recent messages on freebsd-stable, CPU frequency control and Enhanced SpeedStep is broken for modern Core 2 and Xeon processors. At least my 2950 III is now ready for whatever fixes may become available to that code. I believe the problem may be that FreeBSD doesn't know it needs to change the frequency of several cores at once - after all, my 8 core box is two chips of two processors of two cores each. If any developer is interested in fixing the CPU frequency control / Enhanced SpeedStep code, I might be able to contribute a small amount of finance towards this work. Please email me directly. Best wishes, David -- David Wood david@wood2.org.uk
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