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Jesper Dangaard Brouer
Worked at Red Hat Software
Attended University of Copenhagen
Lives in Denmark
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Jesper Dangaard Brouer

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Finally, there is a easy-to-use browser based speedtest that also
measures bufferbloat:

 http://www.dslreports.com/speedtest

After you run the test, click the green "Results + Share" button to see more detailed information.  Which will contain a graph with "Ping response under load", which will indicate if you have bufferbloat on your link.

There is also an article about it here:  http://www.internetsociety.org/blog/tech-matters/2015/04/measure-your-bufferbloat-new-browser-based-tool-dslreports

Go share with the world :-)
Use our NEW speed test tool to test how fast your broadband or mobile internet connection really is. Read broadband news, information and join our community
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I highly recommend watching my colleague +Hannes Frederic Sowa  tutorial on advanced perf tricks!
 - Title: "Tutorial on perf Usage"
 - Video: https://www.youtube.com/watch?v=W0gtG67GUIw
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Indeed, one of the best I've seen.
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This just got announced: Christoph Hellwig has filed a lawsuit against VMware for violating the GPL on the Linux kernel
The Software Freedom Conservancy provides a non-profit home and services to Free, Libre and Open Source Software (FLOSS) projects.
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+Christoph Lameter LCA2015 talk is also avail on YouTube.
Title: "SLUB fastpath improvements and potential booster shots through bulk alloc and free"

And it is related to my LCA2015 talk.

It also got covered by LWN: http://lwn.net/Articles/629152/
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Stop hiding the fact that bufferbloat exists!

Solutions exists, and they are even free.  Stop wasting support time denying it exist in your network.  Just get your act together and start deploying the solutions +Virgin Media 
 
I lost my temper this morning. I would appreciate everyone here that cares about #bufferbloat to create an account and pile on virgin media after checking out my blog post http://the-edge.blogspot.com/2015/03/virgin-media-fixing-epidemic-of.html

I did my best to keep it civil, but of late, it has become hard to keep the venom back. Please see if you can be more constructive and do better.

Please also reshare, and amplify as best you can. I also submitted the story to slashdot, and reddit and twitter.

http://slashdot.org/submission/4236559/virgin-media-censors-talk-of-bufferbloat-on-their-discussion-forums

http://www.reddit.com/r/Network/comments/2xlydp/virgin_cable_censors_explanations_of_how_to_fix/

https://twitter.com/mtaht/status/572181415942488064
To whom it may concern at Virgin Media: My IP address is apparently now banned from accessing your site at all, for "advertising", on this thread about bufferbloat... and my post, was deleted. For the record, that url was: ...
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I'll stop hiding everything the day people stop using the word "bufferbloat"
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We have open sourced the code of our #VBDb website, http://VBDb.itu.dk, under MIT license. This is a #JavaScript front-end for visualizing data coming from a #Bitbucket repository, https://bitbucket.org/modelsteam/vbdb in our case. This was developed by Tony Beltramelli, who did an awesome work having limited time and resources.

You can now fork and adapt it to fit your needs :-)
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Love the funny description of the kernel option for disabling legacy virtio PCI suppport (VIRTIO_PCI_LEGACY)... when to disable ... "look out into your driveway.  Do you have a flying car?"

Full quote:"
CONFIG_VIRTIO_PCI_LEGACY:

Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.

This option enables building a transitional driver, supporting
both devices conforming to Virtio 1 specification, and legacy devices.
If disabled, you get a slightly smaller, non-transitional driver,
with no legacy compatibility.

So look out into your driveway.  Do you have a flying car?  If
so, you can happily disable this option and virtio will not
break.  Otherwise, leave it set.  Unless you're testing what
life will be like in The Future.
"

Looks like the indirect work of +Rusty Russell ... :-)

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=46506da5f365efe
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Excellent description of this cool concurrent data structure, really worth reading! :)
 
Learn more about our fast lock-free hash table.
Non-blocking data structures and their benefits often come at the cost of increased latency because they require additional complexity in the common case. There are plenty of exceptions to this if the requirements of the data structure are relaxed, such as supporting only a bounded level of ...
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Released: IPTV-analyzer v0.9.4

It has been quite some time since the last release.  This release primarily contains adjustments to adapt for changing kernel APIs over time. Did a small labtest of kernel 3.18.6.

Primarily did the release on request by +Kristian Larsson and +Mikael Abrahamsson so they can start working on IPv6 support.

Homepage: http://www.iptv-analyzer.org/wiki/index.php/Releases

Github: https://github.com/netoptimizer/IPTV-Analyzer/releases/tag/v0.9.4

Download:
1) http://iptv-analyzer.com/download/release/
or 2) http://people.netfilter.org/hawk/iptv-analyzer/release/
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My LCA2015 talk is avail on YouTube.
Title: "Kernel network stack challenges at increasing speeds: The 100Gbit/s challenge"

This also got covered by LWN: http://lwn.net/Articles/629155/

Slides here: http://people.netfilter.org/hawk/presentations/LCA2015/net_stack_challenges_100G_LCA2015.pdf
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Education
  • University of Copenhagen
    Computer science, 2005
Basic Information
Gender
Male
Story
Tagline
Linux Kernel Developer in the network area, with a passion for scalability and performance
Work
Occupation
Linux Kernel Developer
Employment
  • Red Hat Software
    Senior Software Engineer
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Denmark
Previously
Copenhagen - Montreal - Auckland