[Iccrg] Re: Timely reaction time (Re: [R-C] Comments on draft-alvestrand-rtcweb-congestion-01)
michawe@ifi.uio.no (Michael Welzl) Mon, 02 April 2012 06:44 UTC
From: michawe@ifi.uio.no
Date: Mon, 02 Apr 2012 06:44:25 +0000
Subject: [Iccrg] Re: Timely reaction time (Re: [R-C] Comments on draft-alvestrand-rtcweb-congestion-01)
In-Reply-To: <CAPpWWaJrZ9p76Zo4=4PPgr3rHBdT2eWh5qo3b4+AAaMxU0qH4Q@mail.gmail.com>
References: <912B62D9-7080-4CC0-B9BE-5328E72DDE60@ifi.uio.no> <CAEdus3L3Ovsnh5hrteh4tw9n-=KTwDZ736Y-TFB8qmaSjEXsTA@mail.gmail.com> <00F17F90-3FFC-4782-BADF-DC4132145DB1@ifi.uio.no> <4F756FC7.80703@alvestrand.no> <B3BAA633-3031-4DA2-934D-82849F05950F@ifi.uio.no> <CAPpWWaJrZ9p76Zo4=4PPgr3rHBdT2eWh5qo3b4+AAaMxU0qH4Q@mail.gmail.com>
Message-ID: <B08158E2-7E51-4986-B522-89C1A336A34D@ifi.uio.no>
X-Date: Mon Apr 2 06:44:25 2012
Argh, yes, I guess this one letter was the cause of a misunderstanding... Thanks! Sent from my iPod On Apr 1, 2012, at 23:56, Lachlan Andrew <lachlan.andrew@gmail.com> wrote: > Greetings Michael, > > Are you saying you need an emergency "brake" (i.e., slowing down) > rather than emergency "break" (i.e., termination, with or without a > restart later)? > > Cheers, > Lachlan > > On 30 March 2012 21:17, Michael Welzl <michawe@ifi.uio.no> wrote: >> >> On Mar 30, 2012, at 10:33 AM, Harald Alvestrand wrote: >> >>> On 03/29/2012 01:55 PM, Michael Welzl wrote: >>>> >>>> >>>> >>>>> Section 4: par 3, "This algorithm is run every time a receive >>>>> report >>>>> arrives..." => so in case of severe congestion, when nothing >>>>> else arrives, >>>>> this algorithm waits for 2 * t_max_fb_interval... so can we rely >>>>> on the >>>>> mechanism to react to this congestion after roughly an RTO or >>>>> not? (sounds >>>>> like not) Is that bad? (I guess) >>>>> >>>>> There is a need for some emergency break mechanism if no >>>>> feedback gets >>>>> through. >>>> >>>> >>>> I totally agree - what I meant is, it isn't clear to me if that >>>> emergency >>>> break is activated in time or too late. It should be in time >>>> (i.e. after >>>> roughly an RTO). >>> >>> This seems to be a subject that should be discussed in the context >>> of the >>> circuit-breakers draft: What kind of response time is appropriate >>> for such a >>> mechanism, and why? >> >> >> I think not: we're talking about two kinds of situations here. The >> context >> here is: there was congestion, we should react to it within an RTO >> (and have >> an "emergency break" to always do that - but maybe that term was >> misleading). The circuit-breakers draft is about a much more serious >> condition (such as persistent congestion), warranting a much more >> serious >> reaction (terminating the connection). >> >> Cheers, >> Michael > > > > -- > Lachlan Andrew Centre for Advanced Internet Architectures (CAIA) > Swinburne University of Technology, Melbourne, Australia > <http://caia.swin.edu.au/cv/landrew> > Ph +61 3 9214 4837
- [Iccrg] Re: Timely reaction time (Re: [R-C] Comme… Michael Welzl
- [Iccrg] Timely reaction time (Re: [R-C] Comments … Harald Alvestrand
- [Iccrg] Re: [R-C] Comments on draft-alvestrand-rt… Piers O'Hanlon
- [Iccrg] Re: [R-C] Comments on draft-alvestrand-rt… Michael Welzl
- [Iccrg] Comments on draft-alvestrand-rtcweb-conge… Michael Welzl
- [R-C] [Iccrg] Re: Timely reaction time (Re: Comme… Michael Welzl
- [Iccrg] Re: Timely reaction time (Re: [R-C] Comme… Michael Welzl
- [Iccrg] Re: Timely reaction time (Re: [R-C] Comme… Lachlan Andrew