Speed Improvement with Yosemite

I’ve recently upgraded to MacOS 10.10, a.k.a. Yosemite. Here’s a measurement of my wired throughput to my server. Before, I got a maximum of about 75 MB/sec on large files. This is a nice improvement…


By mnott on 2014/10/30 | Computer | A comment?

Lync cycles login on Yosemite (fixed)

When connecting with Lync on Yosemite, and your primary system language is not English (how could that potentially be…), Lync up to 14.0.9 will cycle the login process. Microsoft has acknowledge the problem and provided for a fix.

Thermal Problem with MacBook Air 2013

Same procedure as last year, Ms Sophie? I’ve had another round of checking Apple’s Thermal Paste, this time on two MacBook Air’s I’ve bought about a year ago. And, just like before, same problem. Read more…

By mnott on 2014/10/29 | Computer | A comment?

So that’s how it looks if you upgrade your WIFI…

Three Nighthawk X6‘s arrived. Bricked one hacking it misconfiguring DD-WRT; serial cable debricks it. Here’s some throughput that brings it to precisely half my wired network connection (measured OTA from my 2013 Macbook Air to my server which is wired using Gigabit LAN / Cat7 to the routers, measured to 943 Mbit/s):


mnott-laptop:~ mnott$ iperf -c monster -P 10 -w 1000k
Client connecting to, TCP port 5001
TCP window size: 257 KByte (WARNING: requested 1000 KByte)
[ 13] local port 53571 connected with port 5001
[ 4] local port 53562 connected with port 5001
[ 5] local port 53563 connected with port 5001
[ 6] local port 53564 connected with port 5001
[ 7] local port 53565 connected with port 5001
[ 9] local port 53567 connected with port 5001
[ 8] local port 53566 connected with port 5001
[ 12] local port 53570 connected with port 5001
[ 10] local port 53568 connected with port 5001
[ 11] local port 53569 connected with port 5001
[ ID] Interval Transfer Bandwidth
[ 13] 0.0-10.0 sec 61.0 MBytes 51.1 Mbits/sec
[ 5] 0.0-10.0 sec 61.0 MBytes 51.0 Mbits/sec
[ 9] 0.0-10.0 sec 61.0 MBytes 51.0 Mbits/sec
[ 8] 0.0-10.0 sec 61.0 MBytes 51.1 Mbits/sec
[ 12] 0.0-10.0 sec 60.8 MBytes 50.9 Mbits/sec
[ 10] 0.0-10.0 sec 60.6 MBytes 50.8 Mbits/sec
[ 11] 0.0-10.0 sec 60.6 MBytes 50.8 Mbits/sec
[ 4] 0.0-10.0 sec 47.9 MBytes 40.0 Mbits/sec
[ 6] 0.0-10.0 sec 61.0 MBytes 51.0 Mbits/sec
[ 7] 0.0-10.0 sec 47.9 MBytes 40.0 Mbits/sec
[SUM] 0.0-10.0 sec 583 MBytes 487 Mbits/sec

By mnott on 2014/10/06 | Computer, Hacks | A comment?

Speed Reading

I’ve been doing some investigation on speed reading, here’s there result.

By mnott on 2014/05/28 | Computer, Hacks, Science | A comment?

Apple clearly depreciates some of the files I have.

Negative Count

By mnott on 2014/03/12 | Computer | A comment?

Variations on “the nerdiest Video ever”

Have shown this to my little daughter. She really likes string theory, so I’ve got that going for me, which is nice…

Douglas Adams and Terry Pratchett for Kids

Yesterday’s post regarding the adoption of Perl and RegEx in early childhood has raised some questions as per to which degree we should expose our kids to potentially questionable content.

Read more…

By mnott on 2014/03/11 | Hacks, Philosophy, Private | A comment?

Perl’s for Kids (and Regular Expressions, too)

We’ve just finished a field study looking at the ability of less than two-year olds starting to learn Perl and Regular Expressions. To avoid any gender bias, we have focused on the female population. From a statistical point of view, we have been able to get 100 % participation of our dataset, which means we have a very clear proof that Perl and RegEx are for Kids. So, if you didn’t look at those, or procrastinated rather than learning Perl, what are you waiting for?

Here are some pics from our study…

By mnott on 2014/03/10 | Code, Private | 1 comment

Experiencing random, but predictable crashes with VirtualBox running SuSE SLES 11.3 (solved)

This one was not easy to solve. Running SuSE SLES 11.3 as guest in VirtualBox 4.2.18 on an otherwise entirely stable host (Linux 3.11.0 running Ubuntu 13.10), my 64 bit SLES VMs would randomly just “stuck”, consuming full CPU usage on the host system for the cores I had assigned to them. If not touched, they would remain in that state forever. Netconsole to another host did not reveal anything of value. All other machines (about 20 at the same time on any normal day) would continue running with no issues. So what was so special about SLES that made these machines hang?

Read more…

By mnott on 2014/02/21 | Computer | A comment?