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 13:09:16 +0200 Sender: cpufreq-bounces+glkc-cpufreq=gmane.org@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+glkc-cpufreq=gmane.org@www.linux.org.uk Content-Type: text/plain; charset="iso-8859-1" To: cpufreq@www.linux.org.uk Cc: linux-kernel@vger.kernel.org mru@kth.se (M=E5ns Rullg=E5rd) 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. I might add that this was on an Asus M2400E laptop. /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Mobile Intel(R) Pentium(R) 4 - M CPU 1.80GHz stepping : 7 cpu MHz : 2070.179 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36= clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid bogomips : 4087.80 --=20 M=E5ns Rullg=E5rd mru@kth.se