From mboxrd@z Thu Jan 1 00:00:00 1970 From: mru@kth.se (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=) Subject: Re: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver Date: Tue, 21 Oct 2003 12:57:15 +0200 Sender: cpufreq-bounces@www.linux.org.uk Message-ID: References: <88056F38E9E48644A0F562A38C64FB60077911@scsmsx403.sc.intel.com> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: cpufreq-bounces@www.linux.org.uk Content-Type: text/plain; charset="iso-8859-1" To: cpufreq@www.linux.org.uk Cc: linux-kernel@vger.kernel.org "Pallipadi, Venkatesh" writes: > Most of the latest CPUs (laptop CPUs in particular) have feature=20 > which enable very low latency P-state transitions=20 > (like Enhanced Speedstep Technology-EST). Using this feature,=20 > we can have a lightweight in kernel cpufreq governor,=20 > to vary CPU frequency depending on the CPU usage. The=20 > advantage being low power consumption and also cooler laptops. So, I took this thing for a spin, but it didn't work at all. I loaded the module, and did "echo demandbased > /sys/.../scaling_governor". This echo never returned, and the keyboard locked up. After a little while, the fan started running at full speed. I managed to cut and paste into an xterm and start top, which showed nothing unusual. I could shut down and reboot normally. --=20 M=E5ns Rullg=E5rd mru@kth.se