Gaël Duval’s blog, le Blog de Gaël Duval / Linux, open source, Mandrake, Mandriva, Ulteo

French Minister talks about Mandriva! / La ministre Kosciusko-Morizet cite Mandriva !

June 19th, 2009

“on est quand même un des pays qui a la possibilité avec le linux français Mandriva de savoir créer un système d’exploitation grand public c’est pas donné à tout le monde” - prise de conscience naissante des politiques, au bout de 10 ans, enfin ! (Video - à 9′)

Posted in Misc | No Comments »

Only ever photographies of a Space Shuttle and the HST (Hubble) in front of the Sun / Photographies d’une navette spatiale et du HST (Hubble) passant devant le soleil

May 17th, 2009

Those exceptional images were taken on April 13th, by Thierry Legault, an astrophotograph. Ces images exceptionnelles ont été prises le 13 avril par Thierry Legault, un astrophotograph.

Atlantis in front of the Sun

Atlantis and HST in front of the Sun

All images…

Posted in Ecology, Misc | Comments Off

Open Virtual Desktop v1.0 out w/support for both Win and Linux apps!

April 24th, 2009

Look at Ulteo homepage

Posted in General IT, Ulteo | Comments Off

Gravity trains: the greenest transportation! Le moyen de transport le plus écologique : les trains à gravitation !

April 2nd, 2009

Read about Gravity trains, it’s awesome.

Posted in Ecology, Misc | Comments Off

IP Traffic Shaping on Linux

December 16th, 2008

Recently I got interested in traffic shaping to simulate various bandwidth capacities. It was a headache to find a working software in that field until I realized that 1) it was easy 2) it was straighforward on Linux kernel since version (2.2.x?).

First of all, you need to modrobe a few kew kernel modules: cls_u32, sch_cbq, ip_tables

Then all you have to do is to use the “tc” utility which is part of the iproute package.

For instance, let’s assume that you want to limit incoming and outgoing traffic to 256kbits/s on your local host, and assuming that you have a 100Mbps capable network interface on eth0, what you have to do is:

# tc qdisc add dev eth0 root handle 1: cbq avpkt 1000 bandwidth 100mbit
# tc class add dev eth0 parent 1: classid 1:1 cbq rate 256kbit allot 1500 prio 5 bounded isolated
# tc filter add dev eth0 parent 1: protocol ip prio 16 u32 match ip dst 0/0 flowid 1:1

Then if you want to change the limit, use “replace” instead of “add” in the second command. For instance:

# tc class replace dev eth0 parent 1: classid 1:1 cbq rate 64kbit allot 1500 prio 5 bounded isolated

You will notice easily that it’s doing the job very well.

Anyway, I went into some troubles when I started to monitor the traffic: the bandwidth that I set with tc doesn’t fit at all with the actual limitation. For instance, when setting 50kbit in tc, I get a real limitation of around 24 *kBytes* per second, which is about 200kbps. At first, I thought it was a problem with “knetdockapp” that I’m using to monitor the traffic. So I used Bandwidthd which shew similar results, and finally, I transferred a big file during 60 seconds and calculated the real rate from the number of bytes that were received. The results were still the same.

So I’m still wondering why there is such a difference between the figure provided to tc and the real shaped bandwidth.

Posted in General IT, Open source/Free Software | No Comments »

Ulteo unveils the first Open Source virtual desktop, providing businesses with quicker, cheaper deployment and easier applications management

November 19th, 2008

Following its commitment to desktop virtualization solutions, Ulteo, an Open Virtual Desktop Infrastructure company, announced today that they were releasing the first version of their Open Virtual Desktop solution for enterprises. Delivering faster deployment times and ease of management for the IT department, this first release can be integrated easily into an existing professional Linux or Windows IT environment. The solution can be up and running in a few minutes, delivering rich desktop applications to corporate users.

How to get OpenOffice in Nivio?

September 12th, 2008

I was recently trying Nivio, the Online Desktop project that raised about 18 M€ to fuel its development, and I noticed there was no wordprocessor available. But I found a solution: open Internet Explorer and launch Ulteo Online Desktop. You’re done!

Posted in General IT, Misc, Ulteo | No Comments »

New Ulteo Application System coming soon

September 11th, 2008

It’s slick, automatic, and have the latest software version inside (Firefox 3, OpenOffice 2.4…). We’re on track to release the first alpha of Ulteo “Polaris”, and guess what? Soon you may be able to play with the first Ulteo SBC/VDI solution for corporates.

Posted in Open source/Free Software, Ulteo | No Comments »

Google Chrome is out

September 2nd, 2008

Google Chrome, a new web browser - based on Apple WebKit - aimed at surfing the world wide web, has been released by Google today. Only available for Windows for now, it should be available for other plateforms such as Linux later. What is funny, in my opinion, is that normally, releasing a new web browser should have made not even a news wavelet in the IT world. But Google is releasing it, so it makes a lot of noise. It’s clear that even if they were to release a toilet bowl, that would generate a lot of press. The good news is that they are releasing this product as Open Source, because (they)”owe a great debt to many open source projects, (…) We’ve used components from Apple’s WebKit and Mozilla’s Firefox” (which are open source projects). The question to Google now is: why don’t you improve Webkit and Firefox features and performance instead of releasing your own web browser? Other question: licensing. According to Wikipedia, Google Chrome is covered by BSD licensing but as far as I know, WebKit is covered by the LGPL. So, find the bug (if any). Regarding Mozilla, I don’t know enough about its licensing, so maybe it can be converted to BSD. I’ve tried to find information about source code licensing on the Chrome web site, but I couldn’t find any in 5 minutes. And by the way, why no antialiasing for text rendering? What else? Hmm… OK, we have a new web browser around there. Let’s dance.

Posted in General IT, Misc, Open source/Free Software | No Comments »

Mandrake Linux is 10 Years Old today

July 23rd, 2008

Happy birthday baby. At least you turned 10! In some way.

Gaël.

Posted in Open source/Free Software | No Comments »

Gaël Duval’s blog, le Blog de Gaël Duval

French Minister talks about Mandriva! / La ministre Kosciusko-Morizet cite Mandriva !

Only ever photographies of a Space Shuttle and the HST (Hubble) in front of the Sun / Photographies d’une navette spatiale et du HST (Hubble) passant devant le soleil

Open Virtual Desktop v1.0 out w/support for both Win and Linux apps!

Gravity trains: the greenest transportation! Le moyen de transport le plus écologique : les trains à gravitation !

IP Traffic Shaping on Linux

Ulteo unveils the first Open Source virtual desktop, providing businesses with quicker, cheaper deployment and easier applications management

How to get OpenOffice in Nivio?

New Ulteo Application System coming soon

Google Chrome is out

Mandrake Linux is 10 Years Old today

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