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[Xen-devel] why are deep cstates disabled?
| To: | "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] why are deep cstates disabled? |
| From: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
| Date: | Mon, 19 Oct 2009 10:03:24 -0700 (PDT) |
| Delivery-date: | Mon, 19 Oct 2009 10:04:04 -0700 |
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I'm trying to get deep C states to work on my Dell D630 running a Core 2 Duo (Merom) T7300. The output of "xm debug-key c" implies that the processor supports C3, but max_cstate is set to 1. Digging through the code and adding some debug printk's, I see that max_cstate is being changed from 7 to 1 by cpuidle_disable_deep_cstate(), which was added at c/s 19549. Am I reading correctly from: http://lists.xensource.com/archives/html/xen-devel/2009-04/msg00490.html that if a platform has no HPET (or it is disabled), no deep C power states are permitted? My D630 has no HPET... or at least there is no indication in the BIOS menu that there is an HPET. I tried setting "hpetbroadcast" and dom0 boot fails. Is there any way to get C3 working on my box or am I out of luck? Thanks, Dan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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