Re: [ledbat] Fwd: New Version Notification for draft-ietf-ledbat-congestion-08.txt
Mirja Kuehlewind <mirja.kuehlewind@ikr.uni-stuttgart.de> Fri, 28 October 2011 13:52 UTC
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From: Mirja Kuehlewind <mirja.kuehlewind@ikr.uni-stuttgart.de>
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Subject: Re: [ledbat] Fwd: New Version Notification for draft-ietf-ledbat-congestion-08.txt
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Thanks, Arjuna. I added two sentences here: "LEDBAT takes the minimum delay it measures at any time as the base delay and compares the current delay measurement to this value to calculate the queuing delay. off_target compares the queuing delay to the dedicated TARGET chosen and is normalizes by the TARGET value itself." Does this work? Mirja On Saturday 15 October 2011 10:56:49 Arjuna Sathiaseelan wrote: > Another thing which I forgot to point out - in section 3.4.1 the term > off_target suddenly pops up without an explanation. That needs to be > resolved please. > > Regards > Arjuna > > On 15 October 2011 09:37, Arjuna Sathiaseelan <arjuna@erg.abdn.ac.uk> wrote: > > Dear Jana and others, > > > > I went through the draft and am currently trying to figure out what > > the performance implications are with the latest draft through > > simulations (I have a few helpful UG students in India who have > > volunteered to do this for me - this includes modifying the current > > ns-2 code to reflect the latest draft). But unfortunately, I dont > > think we will be able to tell anything useful before WGLC ends! > > > > However I have one question -> > > " A CTO is used to detect heavy congestion indicated by loss of all > > outstanding data or acknowledgments, resulting in reduction of the > > cwnd to 1 MSS and an exponential backoff of the CTO interval" > > > > So I am trying to see whether heavy congestion actually means loss of > > "ALL" outstanding segments - so how does LEDBAT behave according to > > the current draft if atleast one packet went through? Just trying to > > understand. > > > > Regards > > Arjuna > > > > On 10 October 2011 00:51, Janardhan Iyengar <jana.iyengar@gmail.com> wrote: > >> Dear all, > >> > >> A new version of the congestion control draft is in the repository. > >> There are two major mods in this revision: > >> > >> 1/ WGLC identified one major issue that needed to be addressed in the > >> LEDBAT congestion control draft -- LEDBAT response to extreme congestion > >> -- and we've tried to address that issue in this revision. We've added a > >> new mechanism, the Congestion Timeout (CTO), for a sender to respond to > >> extreme congestion. We do not specify how this should be implemented, > >> but we do note that a CTO can be implemented with or without a timer. In > >> terms of textual changes, we've added an update_CTO() function and a > >> branch for what to do if no acks are received within a CTO amount of > >> time in Section 3.4.2. We have changed the response to data loss to > >> ensure that a protocol, such as TCP, that uses the same timer for both > >> congestion control and for > >> retransmissions, changes its cwnd correctly. > >> > >> 2/ We have set the values for INIT_CWND to 4 and MIN_CWND to 2, and have > >> clarified the discussion of CURRENT_DELAYS and INIT_CWND/MIN_CWND in > >> Section 3.5. > >> > >> Please comment! > >> - jana > >> > >> -- > >> Janardhan Iyengar > >> Assistant Professor, Computer Science > >> Franklin & Marshall College > >> http://www.fandm.edu/jiyengar > >> > >> > >> -------- Original Message -------- > >> Subject: New Version Notification for > >> draft-ietf-ledbat-congestion-08.txt Date: Sun, 09 Oct 2011 16:33:33 > >> -0700 > >> From: internet-drafts@ietf.org > >> To: jiyengar@fandm.edu > >> CC: jiyengar@fandm.edu, mirja.kuehlewind@ikr.uni-stuttgart.de, > >> greg@bittorrent.com, shalunov@bittorrent.com > >> > >> A new version of I-D, draft-ietf-ledbat-congestion-08.txt has been > >> successfully submitted by Janardhan Iyengar and posted to the IETF > >> repository. > >> > >> Filename: draft-ietf-ledbat-congestion > >> Revision: 08 > >> Title: Low Extra Delay Background Transport (LEDBAT) > >> Creation date: 2011-10-09 > >> WG ID: ledbat > >> Number of pages: 19 > >> > >> Abstract: > >> LEDBAT is an experimental delay-based congestion control algorithm > >> that attempts to utilize the available bandwidth on an end-to-end > >> path while limiting the consequent increase in queueing delay on the > >> path. LEDBAT uses changes in one-way delay measurements to limit > >> congestion that the flow itself induces in the network. LEDBAT is > >> designed for use by background bulk-transfer applications; it is > >> designed to be no more aggressive than TCP congestion control and to > >> yield in the presence of any competing flows when latency builds, > >> thus limiting interference with the network performance of the > >> competing flows. > >> > >> > >> > >> > >> The IETF Secretariat > >> _______________________________________________ > >> ledbat mailing list > >> ledbat@ietf.org > >> https://www.ietf.org/mailman/listinfo/ledbat > > > > -- > > http://about.me/arjuna.sathiaseelan > > _______________________________________________ > ledbat mailing list > ledbat@ietf.org > https://www.ietf.org/mailman/listinfo/ledbat -- ------------------------------------------------------------------- Dipl.-Ing. Mirja Kühlewind Institute of Communication Networks and Computer Engineering (IKR) University of Stuttgart, Germany Pfaffenwaldring 47, D-70569 Stuttgart tel: +49(0)711/685-67973 email: mirja.kuehlewind@ikr.uni-stuttgart.de web: www.ikr.uni-stuttgart.de -------------------------------------------------------------------
- [ledbat] Fwd: New Version Notification for draft-… Janardhan Iyengar
- Re: [ledbat] Fwd: New Version Notification for dr… Joe Touch
- Re: [ledbat] Fwd: New Version Notification for dr… Mirja Kuehlewind
- Re: [ledbat] Fwd: New Version Notification for dr… Joe Touch
- Re: [ledbat] Fwd: New Version Notification for dr… Gorry Fairhurst
- Re: [ledbat] Fwd: New Version Notification for dr… Arjuna Sathiaseelan
- Re: [ledbat] Fwd: New Version Notification for dr… Arjuna Sathiaseelan
- Re: [ledbat] New Version Notification for draft-i… Joe Touch
- Re: [ledbat] New Version Notification for draft-i… David Ros
- Re: [ledbat] New Version Notification for draft-i… Joe Touch
- Re: [ledbat] New Version Notification for draft-i… Gorry Fairhurst
- Re: [ledbat] New Version Notification for draft-i… Arjuna Sathiaseelan
- Re: [ledbat] New Version Notification for draft-i… Joe Touch
- Re: [ledbat] Fwd: New Version Notification for dr… Mirja Kuehlewind
- Re: [ledbat] Fwd: New Version Notification for dr… Mirja Kuehlewind
- Re: [ledbat] Fwd: New Version Notification for dr… Arjuna Sathiaseelan
- Re: [ledbat] Fwd: New Version Notification for dr… Arjuna Sathiaseelan