Hi Michael, thanks for the pointer. Looking forward to the talk...
Regards Roland On 23.03.19 at 18:48 Michael Welzl wrote: > Hi, > > I’ll do what academics do and add our own data point, below: > >> On Mar 23, 2019, at 4:19 PM, Roland Bless <roland.bl...@kit.edu >> <mailto:roland.bl...@kit.edu>> wrote: >> >> Hi Mikael, >> >> On 23.03.19 at 11:02 Mikael Abrahamsson wrote: >>> On Sat, 23 Mar 2019, Roland Bless wrote: >>> >>>> I suggest to use an additional DSCP to mark L4S packets. >>> >>> DSCP doesn't work end-to-end on the Internet, so what you're suggesting >>> isn't a workable solution. >> >> It's true that DSCPs may be remarked, but RFC 2474 >> already stated >> >> Packets received with an unrecognized codepoint SHOULD be forwarded >> as if they were marked for the Default behavior (see Sec. 4), and >> their codepoints should not be changed. >> >> The rtcweb WG also counts on e2e DSCPs. >> After the LE PHB experience I would suggest to probably use >> DSCP 5 which has got better chances to survive ToS bleaching (maybe >> around 80%), if I understand >> https://www.sciencedirect.com/science/article/pii/S0140366417312835 >> correctly. Diffserv behavior is usually configurable and can be changed >> without replacing the network gear. > > Runa Barik, Michael Welzl, Ahmed Mustafa Elmokashfi, Thomas Dreibholz, > Stein Gjessing: "Can WebRTC QoS Work? A DSCP Measurement Study", 30th > International Teletraffic Congress (ITC 30), 3 - 7 September 2018, > Vienna, Austria. > https://itc-conference.org/_Resources/Persistent/780df4482d0fe80f6180f523ebb9482c6869e98b/Barik18ITC30.pdf > > We didn’t measure undefined codepoints though, only EF, AF42 and CS1. > Table 2 compares bleaching for these codepoints with the results in the > paper you point to; it’s quite similar. > Well yes, there’s a significant amount of bleaching, we can’t deny that. > But sometimes the codepoint survives, and it seems to survive > surprisingly long into the path (fig.4 in our paper). > > In the MAPRG session in Prague, Runa Barik will give a talk about the > measured delay impact of such opportunistic use of these DSCP values by > an end system. > > Cheers, > Michael > _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat
