Date: Tue, 19 Jun 2012 14:42:42 -0700 From: Sean Bruno <seanbru@yahoo-inc.com> To: Andriy Gapon <avg@freebsd.org> Cc: "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org> Subject: Re: [CFT] Sparse Cstate Support -- Its possible, that I don't know what I'm doing. Message-ID: <1340142162.3201.12.camel@powernoodle.corp.yahoo.com> In-Reply-To: <4FE0EA24.6000906@FreeBSD.org> References: <1340121728.5203.8.camel@powernoodle> <4FE0EA24.6000906@FreeBSD.org>
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On Tue, 2012-06-19 at 14:07 -0700, Andriy Gapon wrote: > on 19/06/2012 19:02 Sean Bruno said the following: > > The first impact of this behavior is to list C3 as C2 in the list of > > Cstates when you retrieve the cx_supported sysctls for the cpus. > > I do not think that this is a real problem. A cosmetic one - most likely. > Yes, most likely. Except that the code seems to think that the index of the Cstates is good enough for a comparison to value. More over, the sysctl's accept a value like "C3" and manipulate that into an index into the Cstate array without checking for the Cstate value. The impact of this patch corrects this cosmetic display issue. > > The > > second impact is that the power_profile script never drops to a valid > > Cstate when you set the economy_lowest variable in rc.conf. > > Could you please explain if this somehow follows from your first observation and > how? > If not, could you please share your finding on what exactly causes this to happen? > > Also, are we talking about a laptop here? Namely, judging from the reference to > 'economy_lowest', are AC state changes in play? > No, what I was attempting to do was configure a server such that it would attempt to use the C3 state at idle. Since the server gets configured by the power_state scripts via devd, the server is never configured with its global cx_lowest as anything other than C1. e.g: -bash-4.2$ sysctl -a|grep cx_lowest hw.acpi.cpu.cx_lowest: C1 dev.cpu.0.cx_lowest: C1 dev.cpu.1.cx_lowest: C1 -bash-4.2$ sysctl -a|grep cx_supported dev.cpu.0.cx_supported: C1/1 C2/96 dev.cpu.1.cx_supported: C1/1 C2/96 It seems that the rc.conf value of performance_cx_lowest="LOW" is what I really want, not economy_cx_lowest. Sean
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