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  • Groundbreaking treatise on state machines, paxos, specification
  • The RTLinux patent 5,995,745
  • Notes on Security and Common Criteria
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processor architecture

Synchronous processors

Imagine a processor with no interrupts. We can do a lot better and get rid of most exceptions (e.g. system calls, page faults etc.), most peripheral devices/buses, and even cache misses, but let’s start with interrupts. Modern micro-processors are bloated

vy May 11, 2016April 19, 2022 computer architecture Read more

Apple’s A5 chip made in Austin

Although I think it might have been designed here too. The A5 processor – the brain in the iPhone 4S and iPad 2 – is now made in a sprawling 1.6 million square feet factory in Austin owned by Korean

yodaiken December 17, 2011April 19, 2014 systems Read more

Why computers are more and more devices for generating heat from electricity

Why is it that the hardware interfaces of disk drives 30 years ago were simple and clear and they currently require enormously elaborate drivers? Imagine if one could provide a command consisting of (read/write, diskaddress, buffer_address, count, notification_address) so that

yodaiken July 9, 2011April 19, 2014 systems Read more

Processor architecture

I wish that processor architecture was not so committed to a obsolete model of software. For example, it has become clear over the last few years that the sloppy shared memory thread model of programming has multiple drawbacks. Sharing of

yodaiken September 5, 2010October 14, 2016 computer architecture, systems Read more

Virtualization versus Physicalization

Data on the overhead of virtualization is hard to come by. Rackable proposes an interesting alternative that they call physicalization. I wonder whether the CPU is the most important resource to multiplex and I remain totally puzzled by the motivation

yodaiken April 21, 2009 software business Read more

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  • Notes on Security and Common Criteria
  • Download code

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