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Date: Tue, 5 May 2009 01:22:12 +0200
Message-ID: <90a5caac0905041622oaddd7cek52f28a9b018b3ea7@mail.gmail.com>
From: Lucius Windschuh <lwindschuh@googlemail.com>
To: Alexander Motin <mav@freebsd.org>
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Cc: freebsd-current@freebsd.org, freebsd-mobile@freebsd.org
Subject: Re: Fighting for the power.
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2009/5/5 Alexander Motin <mav@freebsd.org>:
> Lucius Windschuh wrote:
>> [...]
>> panic: lapic1: zero divisor
> [...]
> --- local_apic.c.prev =A0 2009-05-01 23:53:37.000000000 +0300
> +++ local_apic.c =A0 =A0 =A0 =A02009-05-05 01:10:04.000000000 +0300
> @@ -319,7 +319,7 @@ lapic_setup(int boot)
> =A0 =A0 =A0 =A0}
>
> =A0 =A0 =A0 =A0/* We don't setup the timer during boot on the BSP until l=
ater. */
> - =A0 =A0 =A0 if (!(boot && PCPU_GET(cpuid) =3D=3D 0)) {
> + =A0 =A0 =A0 if (!(boot && PCPU_GET(cpuid) =3D=3D 0) && lapic_timer_hz !=
=3D 0) {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0KASSERT(lapic_timer_period !=3D 0, ("lapic=
%u: zero divisor",
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0lapic_id()));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0lapic_timer_set_divisor(lapic_timer_diviso=
r);

This patch solves the panic.
C3 instead of C2 saves between 0.5 and 1.5 Watt here with some quick
measurements.

Thanks.

Lucius