Date: Wed, 11 Jul 2012 18:07:03 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Sean Bruno <seanbru@yahoo-inc.com> Cc: "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org>, Vitaly Magerya <vmagerya@gmail.com>, Andriy Gapon <avg@freebsd.org>, Giovanni Trematerra <gianni@freebsd.org> Subject: Re: improve cx_lowest logic Message-ID: <20120711130700.H42038@sola.nimnet.asn.au> In-Reply-To: <1341937886.2573.3.camel@powernoodle.corp.yahoo.com> References: <4FF95F79.30309@FreeBSD.org> <20120711000506.E42038@sola.nimnet.asn.au> <1341937886.2573.3.camel@powernoodle.corp.yahoo.com>
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On Tue, 10 Jul 2012 09:31:26 -0700, Sean Bruno wrote: > On Tue, 2012-07-10 at 07:27 -0700, Ian Smith wrote: > > I wonder if that explains why setting C3 on aforesaid T23 has no > > effect > > (in terms of dev.cpu.0.cx_usage indicating any time spent in C3) > > unless > > the machine happened to be booted up on battery, in which case C3 is > > shown as working whenever its enabled, by power_profile or manually? > > > > > > silly question, did you set these in /etc/rc.conf ?? > > performance_cx_lowest="LOW" > economy_cx_lowest="LOW" Fair enough question. For years, since 7.0-R, I've been running performance_cx_lowest=C2 economy_cx_lowest=C3 but as reported yesterday, either way it wasn't actually using C3, and I'd checked it several times over maybe 20 minutes. However, after (inadvertantly) leaving hw.acpi.cpu.cx_lowest manually set to C3 while on AC power overnight, this morning I discover: dev.cpu.0.freq: 733 dev.cpu.0.freq_levels: 1133/19100 733/12500 dev.cpu.0.cx_supported: C1/0 C2/84 C3/120 dev.cpu.0.cx_lowest: C3 dev.cpu.0.cx_usage: 0.09% 11.29% 88.61% last 635us So, hmm, C3 must have kicked in sometime later? Now I can merrily change cpu.cx_lowest between C1, C2 or C3 and have that reflected in usage; now C3 on AC: dev.cpu.0.cx_usage: 0.03% 0.75% 99.21% last 683us confused :), Ian
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