A Smackerel of Opinion

Intel Hardware P-State (aka Harware Controlled Performance or "Speed Shift") (HWP) is a feature found in more modern x86 Intel CPU...

A useful feature on modern x86 CPUs is the Running Average Power Limit (RAPL) that allows one to monitor System on Chip (SoC) power consump...

As simple experiment, I thought it would be interesting to investigate stress-ng compiled with GCC 4.9.1 and GCC 5.1.1 in terms of computati...

The cpuburn package contains several hand crafted assembler "burn" programs to load x86 processors and to maximize heat production...

The Linux Running Average Power Limit (RAPL) interface was introduced about 2 years ago in the Linux kernel and allows userspace to read th...

Over the past year or more I was focused on identifying power consuming processes on various mobile devices.  One of many strategies to redu...

Linaro's idlestat is another useful tool in the arsenal of CPU monitoring utilities.  Idlestat monitors and captures CPU C-state and P-...

Measuring power consumption on low power devices really is not as simple as running tools such as PowerTop and then assuming the data is tru...

The Ubuntu Kernel Team has uploaded a new kernel (3.2.0-17.27) which contains an additional fix to resolve the remaining issues seen with th...

The Ubuntu Kernel Team has released a call for testing for a set of RC6 power saving patches for Ubuntu 12.04 Precise Pangolin LTS. Quoting ...

Last month I wrote about the investigations being undertaken to identify any suitable power savings for Ubuntu Precise 12.04 LTS.  Armed wi...

The /proc/timer_stats interface allows one to check on timer usage in a Linux system and hence detect any misuse of timers that can cause ex...

Part of my focus this cycle is to see where we can make power saving improvements for Ubuntu Precise 12.04 LTS. There has been a lot of anec...

Back in February I wrote about turning off a PC using the Intel I/O Controller Hub and had some example code to do this, and it was a dirty...

PCI Express based serial linked devices can be managed by Active State Power Management (ASPM) to extend battery life on mobile devices such...

Shutting down a PC is normally performed by transitioning the machine into an ACPI S5 state which is achieved by writing some magic value in...

My clunky old Lenovo has and Intel(R) Core(TM) Duo CPU (model 15) which coretemp in Lucid 10.04 assumed TjMax was 85 degrees C but now in Ma...

My Lenovo 3000N200 laptop has been playing me up. When I've been fully loading the processor or driving video hard it's been shutti...

A while ago I blogged about power saving on my HPMini . Well, today I'm revisiting this using today's Lucid daily and I'm please...

A few weeks ago I wrote about my experience using an HP Mini netbook - well in this follow up article describes how I reduced the power con...