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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.
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