On 27 Apr 2015, at 11:45, Toke Høiland-Jørgensen <[email protected]> wrote:
> Neil Davies <[email protected]> writes: > >> Take a look at http://www.pnsol.com/publications.html, you may find >> http://www.pnsol.com/public/PP-PNS-2009-02.pdf as a good starting >> point. > > I've seen this referred on the list before (I assume by you ;)), but > haven't really grok'ed it before. I like the delta-Q measure as a way of > thinking about overall network performance; and there's definitely > parallels to thinking about the end-to-end 'latency budget', which I > also find quite instructive (I think I it picked up from Joe Touch at > some point). You'll find the way that ∆Q can be decomposed into basis set of ∆Q|G, ∆Q|S and ∆Q|V - helps work out which parts of the budget get eaten up by different elements of the network design/architecture. > > How do you deal with the fact that loss and delay can be exchanged for > each other (via retransmissions)? Yes, the QTA/∆Q framework is recursive in that sense - you can relate (for example) the "TCP layer ∆Q" to the "IP packet level ∆Q". > > Also, which publication would you recommend if I'm interested in > specifically how you 'Mathematically model behaviour and delta-Q' as you > mention in that slide set? :) > Depends on your starting point: - if it is "how does this relate to the end user" - look at "the properties and mathematics of data transport quality" - if it is "how do I measure this stuff in a real network" - take a look at "advanced network performance measurement techniques" (you can get to it off the links tab) > -Toke Neil _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
