Skip to content

The Isoblog. Posts

FOSDEM: The coming Radio Lockdown

The European Radio Equipment Directive requires all devices that are able to send and receive radio signals to be locked down. Without further specification of exceptions, which has not yet been done, this will affect all devices, including pure receivers such as GPS receivers and car radios, but also mobile phones and amateur radio operators and of course almost all Internet of Trash (IoT) devices.

Hardware manufacturers are required to “install technical measurements to protect the devices from being flashed with ‘non-compliant software'”.

The talk by Max Mehl is available on the FOSDEM site.


Containers 101

It is helpful to remember that containers are just normal Unix processes with two special tricks.

Normal Unix Processes

Unix starts processes by performing a fork() system call to create a new child process. The child process still contains the same program as the parent process, so the parent processes program still has control over the child. It usually performs a number of operations within the context of the new child, preparing the environment for the new program, from within.

PID 17 forks, and creates a new process with PID 18. This process executes a copy of the original program.

Then, after the environment is complete, the parent program within the child processes context replaces itself by calling execve(). This system call unloads the current program in a process and reuses the process to load a new program into it.

Leave a Comment

Load, Load Testing and Benchmarking

(In order to be able to give up the test blog at, I am moving content over)

So you have a new system and want to know what the load limits are. For that you want to run a benchmark.

Basic Benchmarking

The main plan looks like this:

The basic idea: Find a box, offer load, see what happens, learn.

You grab a box and find a method to generate load. Eventually the box will be fully loaded and you will notice this somehow.

Leave a Comment

An Energy Storage Market develops

Renewable Energy World reports in an article titled “Energy Storage Market Outlook 2017” on exactly this subject.

Currently there is not overly much available in terms of capacity in an Energy Storage Market, but what is there is growing very fast, with a forcast of 30GW new installation through the year of 2020, and a compount annual growth rate of 60%.

For the near future, the dominant form of energy storage, pumped hydropower, is sure to remain the principal method of storing energy, occupying a global market share of over 95 percent. Aside from pumped hydro, a plethora of energy storage technologies exist with a growing number of new solutions being tried, tested and installed on a commercial basis. An even larger number reside anywhere between blueprint designs and various levels of research and development.
Going forward, battery storage — of the lithium-ion variety — is expected to retain its majority market share, according to Roberts.

Leave a Comment

Solar Cell manufacturing yield

The MIT is reporting on its own research, trying to explain why certain high-efficiency solar modules are losing efficiency after a few months of operation The difference seems to be in the manufacturing process, in which lower temperatures during firing and keeping out certain impurities seems to reflect favourably on the stability of the produced cells.

Getting higher yield and better long-term stability is key to achieving cheaper solar modules, which will in turn lead to cheaper electricity from sustainable sources.

Leave a Comment

Daimler to convert engine production to electric in Untertürkheim

Elektrek reports:Daimler to convert engine production to electric at its largest factory, fewer workers required causing labor issues

According to that, the Untertürkheim Plant is going to be the place where Daimler will be developing and building their electric motors. Currently 19k people are working there, specialised in ICE building and construction. Electric motors are simpler, have less parts and are easier to construct, so less people will be needed.

The transition will be challenging and structurally transformative for the whole region.


Leave a Comment

Opel: Giving up or going all in?

GM is considering one of two strategies: Giving up and selling the Opel Brand to Peugot, or going all-in electric cars, with the sell-off being more likely.

Selling off Opel would likely kill the Ampera, though.

Being deep into the red for many years, Opel does not have the resources to do both, develop electric cars and new models with ICE, says CEO Karl-Thomas Neumann in an article in Automotive News.

The purported end-date for ICE cars at Opel is weird, though, because they speak about 2030. That’s actually quite late, considering that Smart is ending ICE variants in North America and Norway this year.


1 Comment