Date: Mon, 20 Sep 2010 15:20:04 GMT From: Andriy Gapon <avg@freebsd.org> To: freebsd-acpi@FreeBSD.org Subject: Re: i386/135447: [i386] [request] Intel Core i7 and Nehalem-EP new features not supported Message-ID: <201009201520.o8KFK4e7078034@freefall.freebsd.org>
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The following reply was made to PR i386/135447; it has been noted by GNATS.
From: Andriy Gapon <avg@freebsd.org>
To: Dmitry Kubov <dk@garant.ru>, Alexander Motin <mav@freebsd.org>
Cc: jh@freebsd.org, bug-followup@freebsd.org
Subject: Re: i386/135447: [i386] [request] Intel Core i7 and Nehalem-EP new
features not supported
Date: Mon, 20 Sep 2010 18:11:20 +0300
on 20/09/2010 17:54 Dmitry Kubov said the following:
> dev.cpu.7.cx_supported: C1/3 C2/205 C3/245
Note these------------------------^^^----^^^
> dev.cpu.7.cx_lowest: C3
> dev.cpu.7.cx_usage: 100.00% 0.00% 0.00% last 500us
And this --------------------------------------^^^^^
> C2/C3 not used at all
And now there is this code in acpi_cpu.c:
/* Find the lowest state that has small enough latency. */
cx_next_idx = 0;
for (i = sc->cpu_cx_lowest; i >= 0; i--) {
if (sc->cpu_cx_states[i].trans_lat * 3 <= sc->cpu_prev_sleep) {
cx_next_idx = i;
break;
}
}
205 * 3 and 245 * 3 are both greater than 500, so this is the reason why they are
never entered.
Perhaps Alexander can give some advice here.
--
Andriy Gapon
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