- WLUG - wlug.mailman3.com

Bufferbloat demonstrations w/water and funnels

by Chuck Anderson

Here is a series of videos of a talk by Dave Täht where he uses water and funnels to demonstrate the concepts of bufferbloat: [1] Bufferbloat #1 - TCP 101 [2] Bufferbloat #2 - Tail drop queueing [3] Bufferbloat #3 - FIFO, RED, Blue, and Fair Queueing [4] Bufferbloat #4 - Wifi, Netalyzr, SFQ, SFQRED, and CoDel [5] Bufferbloat #5 - CoDel and Drop Head Queueing [6] Bufferbloat #6 - More on FQ_Codel [7] Bufferbloat #7 - Q&A [1] http://www.youtube.com/watch?v=KD5TwLQnq_8 [2] http://www.youtube.com/watch?v=PgFcqRMDqlk [3] http://www.youtube.com/watch?v=Y9xJbwb28Zc [4] http://www.youtube.com/watch?v=ol_BcKA9Ohg [5] http://www.youtube.com/watch?v=R8Esi0zjNdE [6] http://www.youtube.com/watch?v=bi-jumVNVGk [7] http://www.youtube.com/watch?v=JFH5fGNzBJU

Oct. 14, 2013

Changing your network scheduler in ubuntu 13.04...

by Tim Keller

Just so people know... this is how to change the scheduler on Ubuntu 13.04. tc qdisc replace dev eth0 root fq_codel limit 100 target 5ms interval 30ms ecn Obviously replace "eth0" with your appropriate network device... Enjoy, Tim. -- I am leery of the allegiances of any politician who refers to their constituents as "consumers".

Oct. 14, 2013

Reminder: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Chuck Anderson

Hi folks, The next Worcester Linux Users' Group (WLUG) meeting will be held this Wednesday. This month we will have Jim Gettys from Bell Labs talk about Internet buffer bloat. This is the talk that has been rescheduled from April. Note that there has been a room change to a larger room right down the hall from our regular location. Wednesday, October 9, 7:00 - 9:00 PM WPI Campus Center, Hagglund Room 301 The Campus Center is building #7 on the campus map [1], and the Hagglund Room is room 301 on the Campus Center building floorplan [2]. [1] http://www.wpi.edu/about/visitors/campusmap.html [2] http://www.wpi.edu/Admin/CC/Floorplans/37678.htm "Internet buffer bloat, by Jim Gettys (Bell Labs) VOIP and teleconferencing often perform much more poorly on today's Internet than the Internet of a decade ago, despite great gains in bandwidth. Lots of fiber, cheap memory, smart hardware, variability of wireless goodput, changes in web browser behaviour, changes in TCP implementations, and a focus on benchmarking Internet performance solely by bandwidth, and engineer's natural reluctance to drop packets have conspired to encourage papering over problems by adding buffers; each of which may introduce latency when filled. The mistaken quest to never drop packets has destroyed interactivity under load, and often results in actual higher packet loss, as TCP's congestion avoidance algorithms have been defeated by these buffers. The lessons of the "RED manifesto" of 1997 have been forgotten or never learned by a new generation of engineers." Wednesday, October 9, 7:00 - 9:00 PM WPI Campus Center, Hagglund Room 301 Afterwards, we will go out for pizza. See you there, Chuck President, Worcester Linux Users' Group http://www.wlug.org/

Oct. 7, 2013

Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by joel d

I plan to attend Wednesday's meeting also (90% likely at this point). Joel

Oct. 3, 2013

Re: [Wlug] Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Tim Keller

I plan to attend. On Thu, Oct 3, 2013 at 8:05 AM, Daniel J Walsh <dwalsh(a)redhat.com> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I hope to be there. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.14 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iEYEARECAAYFAlJNXX0ACgkQrlYvE4MpobPU3QCfcPGlJqCA7pQbgE6Wqs2je0nF > KDoAn0uX2j4QZJaOqLE9uB1Cr6Qg5VVt > =38aU > -----END PGP SIGNATURE----- > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug > -- I am leery of the allegiances of any politician who refers to their constituents as "consumers".

Oct. 3, 2013

Re: [Wlug] Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Daniel J Walsh

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I hope to be there. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlJNXX0ACgkQrlYvE4MpobPU3QCfcPGlJqCA7pQbgE6Wqs2je0nF KDoAn0uX2j4QZJaOqLE9uB1Cr6Qg5VVt =38aU -----END PGP SIGNATURE-----

Oct. 3, 2013

Re: [Wlug] Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by The Hammer

I plan to be there. -Ron On Wed, Oct 2, 2013 at 6:07 PM, Chuck Anderson <cra(a)wpi.edu> wrote: > I'd like to gauge how many people plan to go to this meeting, since it > could be popular enough that I might need to get a bigger room. If > people plan to attend, could they chime in? > > Thanks, > Chuck > > On Mon, Sep 23, 2013 at 11:01:41AM -0400, Chuck Anderson wrote: > > Hi folks, > > > > The next Worcester Linux Users' Group (WLUG) meeting will be held at > > its regularly scheduled time: the 2nd Wednesday of the month, which is > > Wednesday, October 9, at 7PM. The location will be the WPI Campus > > Center, Mid-Centry Room 331. > > > > This month we will have Jim Gettys from Bell Labs talk about Internet > > buffer bloat. This is the talk that has been rescheduled from April. > > > > "Internet buffer bloat, by Jim Gettys (Bell Labs) > > > > VOIP and teleconferencing often perform much more poorly on today's > > Internet than the Internet of a decade ago, despite great gains in > > bandwidth. Lots of fiber, cheap memory, smart hardware, variability of > > wireless goodput, changes in web browser behaviour, changes in TCP > > implementations, and a focus on benchmarking Internet performance > > solely by bandwidth, and engineer's natural reluctance to drop packets > > have conspired to encourage papering over problems by adding buffers; > > each of which may introduce latency when filled. > > > > The mistaken quest to never drop packets has destroyed interactivity > > under load, and often results in actual higher packet loss, as TCP's > > congestion avoidance algorithms have been defeated by these > > buffers. The lessons of the "RED manifesto" of 1997 have been > > forgotten or never learned by a new generation of engineers." > > > > Wednesday, October 9, 7:00 - 9:00 PM > > WPI Campus Center, Mid-Centry Room 331 > > > > Afterwards, we will go out for pizza. > > > > See you there, > > Chuck > > President, Worcester Linux Users' Group > > http://www.wlug.org/ > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug >

Oct. 3, 2013

Re: [Wlug] Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Keith Wright

> From: Chuck Anderson <cra(a)WPI.EDU> > > If people plan to attend, I might need to get a > bigger room. If enough people plan to attend, I might need a bigger mail box (or maybe just a bloated buffer). I expect to be there. It will be a fine way to celebrate John Lennon's birthday. -- Keith

Oct. 3, 2013

Re: [Wlug] Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Eric Martin

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 10/2/13 6:07 PM, Chuck Anderson wrote: > I'd like to gauge how many people plan to go to this meeting, since it > could be popular enough that I might need to get a bigger room. If > people plan to attend, could they chime in? > > Thanks, > Chuck I'm in - -- Eric Martin Key Fingerprint = C74F 1EBF 2E80 7984 8CB5 064E BF17 D34C C704 B30F -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (Darwin) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJSTNpxAAoJEL8X00zHBLMP+9QQAJSYvzQ0xKtNLpF6at3eQg56 3x6zz22GkQzUicnTIvN9ZWOajNyWdqz9QLemg8jiT+ZFfr2a6qFudxTaAVMM1ZxP 3Zv4HgKFLGyj2peqPchHOqVEvyvjutOdlaqARZ8znucXHNglifqFvcJDaVDB+9jT RCkHdqUdidUazb3xSKXdwz8IuarLHZ2pG5hAT3LKeIVPcYpZViFAgMkQosCkc78N ibEXYBU6zGDMjmb0Nkzu66pEng4xcNTBP8F1Xfa0VvsrFL8QH+J+GMqqXuSWMTbb b6S/CleQ8iEhtAlDnZrffXtzFIj6qKxG3lJCdpKpIGbDkYMarupSbXn3Xym9G/EX jVUFmvJ0ChJp8QGcB6J5d5bGNzcxr9vrr+YKinvyQtlmd69B7VQ5h35DuZ5Tv+iH wGrmjfV/TAh7Cqft+CujS2gWeBEyLNREyZjLlSvP9nAGHLbW6oHd+A0ldXODgpJe RuNaYb5f3HlTzjjSp9HBjM4y5R5ifVdIpndUYj6xsAxnejfZaQbbMS8Ozgi/lhLd cbm1/emprxWykKIHaYFbOlzyPh347b8FGTKOGdY65Mh7ilUGbUsTsaAjkXYA4jNu Ryj4ZN80oKtNw2OubffAmBuN3AS3Kp58fVvYns5xQDZgXea5aUNYZdBr89P+gNWh r44DsaeUruZmRShW6Dkc =xCCl -----END PGP SIGNATURE-----

Oct. 3, 2013

[SPF:Probably_Forged] Re: Announce: WLUG Meeting Wed 10/9 7PM Jim Gettys on Internet buffer bloat

by Bob

I'll be there. Bob On 10/2/2013 6:07 PM, Chuck Anderson wrote: > I'd like to gauge how many people plan to go to this meeting, since it > could be popular enough that I might need to get a bigger room. If > people plan to attend, could they chime in? > > Thanks, > Chuck > > On Mon, Sep 23, 2013 at 11:01:41AM -0400, Chuck Anderson wrote: >> Hi folks, >> >> The next Worcester Linux Users' Group (WLUG) meeting will be held at >> its regularly scheduled time: the 2nd Wednesday of the month, which is >> Wednesday, October 9, at 7PM. The location will be the WPI Campus >> Center, Mid-Centry Room 331. >> >> This month we will have Jim Gettys from Bell Labs talk about Internet >> buffer bloat. This is the talk that has been rescheduled from April. >> >> "Internet buffer bloat, by Jim Gettys (Bell Labs) >> >> VOIP and teleconferencing often perform much more poorly on today's >> Internet than the Internet of a decade ago, despite great gains in >> bandwidth. Lots of fiber, cheap memory, smart hardware, variability of >> wireless goodput, changes in web browser behaviour, changes in TCP >> implementations, and a focus on benchmarking Internet performance >> solely by bandwidth, and engineer's natural reluctance to drop packets >> have conspired to encourage papering over problems by adding buffers; >> each of which may introduce latency when filled. >> >> The mistaken quest to never drop packets has destroyed interactivity >> under load, and often results in actual higher packet loss, as TCP's >> congestion avoidance algorithms have been defeated by these >> buffers. The lessons of the "RED manifesto" of 1997 have been >> forgotten or never learned by a new generation of engineers." >> >> Wednesday, October 9, 7:00 - 9:00 PM >> WPI Campus Center, Mid-Centry Room 331 >> >> Afterwards, we will go out for pizza. >> >> See you there, >> Chuck >> President, Worcester Linux Users' Group >> http://www.wlug.org/ > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug >

Oct. 2, 2013