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Some time ago I stumbled upon this Hacker News discussion on how disable Spectre mitigation.
(For what Meltdown and Spectre is, refer to this article on 2018)
It is sad to say but my Intel NUC centrino was slowed down a lot by these mitigation, and the same faith is shared by old Intel server. Disabling it on Linux and Windows has a very huge improvements.
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Rasperry Pi Trading announced the RasperryPi 400, a whoppy 1.8 Ghz x 4Gb RAM (about 4096Mb or 4.194.304 Kb) Rasperry in a plastic keyboard case.
We just read a teardown, and only the lack of a good mechanical keyboard leave it a bit behind a Commodore 64 :)
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Se vi dicessi che il 20% delle comunicazioni che il vostro smartphone attua per consentirvi di usare Whatupp o leggere il giornale è verso i server pubblicitari di google, facebook, amazon, come reagireste?
Questo è un articolo divulgativo su uno strumento che è possibile installarsi a casa propria, per proteggere la propria rete Internet dalla pubblicità, e rafforzare la privacy della propria famiglia.
Chi ha bambini piccoli a casa sa che oramai sono in grado di giocare su smartphone o guardare filmati su Youtube. Si pone quindi un problema che va dal controllo di ciò che guardano, alla loro privacy, passando anche per una riduzione della loro esposizione alla pubblicità.
Per intenderci, Youtube non ha una grossa considerazione dello spettatore: le pubblicità non sono correlate con i contenuti, e anche abilitando i filtri per adulti il risultato è che non c’è un controllo su cosa vedono i nostri figli; tradotto in parole semplici, pubblicità inappropriate possono apparire durante la visione di un cartone animato LEGO.
Sto parlando di tutte cose che ho toccato con mano, e fornirò conferme con riferimenti ad altri articoli. Non è mia intenzione allarmare nessuno, ma sensibilizzare tutti sulla esistenza di una onda crescente che sta cercando (in sordina) di imporci un modo di vivere che non dobbiamo per forza abbracciare.
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In the last weekend I needed to restore my RasperryPi service box. It is a raspberrypi 2 which mostly make backups of my blogs.
Its microSD card gets corrupted, forcing me a full reinstall. I decided to try to make everything via Ansible.
I have already a strong experience with Saltstack, another software used to remotely manage and control huge pool of hosts. Saltstack is an agent-based solution which needs some “setup” steps, which would be an overkill for configuring a single small pc. It has a lot of concept on its own.
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Cloud, DevOps, and Microservices are three strong forces are melting together.
Containers is the key technology around them. Before docker, horizontal scaling via VM spinning was feasible but a slow speed, compared to the speed of a docker container boot.
So do you want to learn docker without going out of business? Let’s go!
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Meltdown and Spectre are two big vulnearbilities found in Intel and AMD chips out of there. The vulenarbility is so huge it affects up to 1995 chips.
On the raspberrypi, there is a very nice explanation of what Meltdown is.
First of all, the one who discovered this bug is a GENIUS, for sure.
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To increase performance and SD life of your raspberry PI 2/3, you can follow my first article on this subject.
You can easily increase even more the SD life if you can trade a bit of RAM.
The key idea is to take advantage of tmpfs, which can be resized on the fly too.
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After my two children grow a little, I have some spare time to play with RaspberryPi. I have bought a Raspberry Pi 2 Model B, a very neat and compact machine with 1GB of RAM, and a quad-core ARM chip on it.
I was looking for an easy-to-carry unix box, and I was wrong: raspberry pi can be a lot more than that.

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"The most dangerous phrase in the language is, We’ve always done it this way" - Grace HopperI am a very happy owner of a RaspberryPi Model B 2, a quad core ARMv7 computation unit for a price between 45 and 35 €.
If you plug only a network cable it can be powered by a USB port of your router (!avoid putting on it other USB stuff, because the energy drain can be too much).
RaspberryPI is a perfect all-time-running machine, just follow this smart guide…
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