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 22:39:16 +0200 Sender: cpufreq-bounces@www.linux.org.uk Message-ID: References: <88056F38E9E48644A0F562A38C64FB60077911@scsmsx403.sc.intel.com> <20031021203037.GB3133@sam-solutions.net> 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 Alexander Bokovoy 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. >>=20 >> 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 applied these patches to stock 2.6.0-test8 and selected 'demandbased' as > default governor. In result, everything worked from the very beginning, my > Centrino-based system went to 600MHz and was upping when load was going > higher during compilation or disk access but went down when load was > lowering. So it works well for me. What's your /proc/cpuinfo? Mine says 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 : 2069.912 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