linux-kernel - Kernel: 2.6.31.5: CE: hpet increasing min_delta

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Message-ID: <alpine.DEB.2.00.0911111002220.6957@p34.internal.lan>
Date:	Wed, 11 Nov 2009 10:06:39 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org
Subject: Kernel: 2.6.31.5: CE: hpet increasing min_delta_ns: What do these
 messages mean?

Hello,

System: Intel DP55KG
CPU: Intel Core i870

I see these messages in my kernel log: (2.6.31.5)

[   48.886129] CE: hpet increasing min_delta_ns to 15000 nsec
[ 3258.107039] CE: hpet increasing min_delta_ns to 22500 nsec
[53705.451463] CE: hpet increasing min_delta_ns to 33750 nsec

I only see them when ACPI_FREQ and NO_HZ are enabled, to take advantage
of turbo boost.

It is not the result of throttling:

# cat /sys/devices/system/cpu/*/thermal_throttle/count
0
0
0
0
0
0
0
0

Temps are also good, 1 core @ 100% CPU:

Core 0:      +41.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 1:      +41.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 2:      +54.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 3:      +54.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 4:      +42.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 5:      +42.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 6:      +42.0°C  (high = +84.0°C, crit = +100.0°C) 
Core 7:      +42.0°C  (high = +84.0°C, crit = +100.0°C)

I see various discussions on the meaning of these messages but no clear
answer.

Also in reference to loading ACPI_FREQ I mentioned before that when this
module is loaded and there is no CPU activity, there is a high pitch noise
from the CPU/VRM presumably, when ACPI_FREQ is not loaded, this does not
occur, is this expected?

Justin.