The following reply was made to PR amd64/157386; it has been noted by GNATS.
From: Andriy Gapon
To: David Graham , bug-follo...@freebsd.org
Cc:
Subject: Re: amd64/157386: [powerd] Enabling powerd(8) with default settings
on Intel Xeon-E3 results in system freeze
Date: Tue, 31 May 2011 09:08:48 +0300
on 29/05/2011 17:19 David Graham said the following:
> On 05/29/11 01:59, Andriy Gapon wrote:
>>
>> Can you provide output of the dev.cpu sysctl and a snippet of devinfo
>> command
>> output that shows devices under cpu0?
>>
> Hi Andriy,
>
> ev.cpu.0.%desc: ACPI CPU
> dev.cpu.0.%driver: cpu
> dev.cpu.0.%location: handle=\_SB_.CP00
> dev.cpu.0.%pnpinfo: _HID=none _UID=0
> dev.cpu.0.%parent: acpi0
> dev.cpu.0.freq: 2654
> dev.cpu.0.freq_levels: 2654/-1 2322/-1 1990/-1 1658/-1 1327/-1 995/-1 663/-1
> 331/-1
> dev.cpu.0.cx_supported: C1/0
> dev.cpu.0.cx_lowest: C1
> dev.cpu.0.cx_usage: 100.00% last 2224us
>
[snip]
> cpu0
> acpi_throttle0
> cpufreq0
> acpi_timer0
I'd say that the problem is because of acpi_throttle driver, which is kind of
dangerous and useless driver because of how it regulates frequency.
I usually disable it on my Intel machines via:
hint.acpi_throttle.0.disabled=1
I am a bit surprised that acpi_perf and (dependent on it) est drivers haven't
attached.
--
Andriy Gapon
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