Re: HTTP router point-of-view concerns
Amos Jeffries <squid3@treenet.co.nz> Fri, 12 July 2013 08:28 UTC
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Date: Fri, 12 Jul 2013 20:26:19 +1200
From: Amos Jeffries <squid3@treenet.co.nz>
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Subject: Re: HTTP router point-of-view concerns
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On 12/07/2013 7:35 a.m., Roberto Peon wrote: > I think it is perfectly reasonable for an intermediary to set the > compression size to zero if it wishes. > > Market forces will (in the long-term) pick the correct strategy for > this-- assuming the compression is effective at reducing latency, and > that people care about latency reductions, then eventually > intermediaries might evolve to use it. > If it is ineffective at reducing latency, or if reduced latency is not > actually desirable, then intermediaries would not use it. > > > The DoS vector you're talking about is not a DoS vector if the > intermediary resets all streams before the change-of-state-size comes > into effect. If you means RST_STREAM on all the initial streams which use a larger compression size then what you are doing is adding an RTT penalty to all those requests over and beyond what HTTP/1 suffers from already on a normal transaction. This is not a useful way forward (wastes packets, RTT and stream IDs) and resolving it is to make decompression with the default state size mandatory for all recipients. Which brings us full circle on the problem of having a default >0 in the dynamic part of the state tables. > When the state size is 0, one should be able to use some kinds of > 'indexed' representations, so long as those representations refer only > to items in the static tables. Why do you believe that this would use > more or less CPU? (It should use less CPU and less memory...) I did not mention CPU. Only the bandwidth amplification effects that agents disabling compression would incur and need to consider carefully. Personally I would like to see a 127 entry mandatory static table in the spec itself and tied to the "2.0" version with a 127 entry optional dynamic table indicated by the high-end bit of the byte code. With a capacity byte size for dynamic table sent each way and senders forbidden to add new entries to the dynamic table until they hold the value from both ends of the connection. Agreed value being the minimum of both ends capacities. Amos
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- HTTP router point-of-view concerns Christian Parpart
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Christian Parpart
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Michael Sweet
- Re: HTTP router point-of-view concerns Martin Thomson
- Re: HTTP router point-of-view concerns James M Snell
- Re: HTTP router point-of-view concerns Sam Pullara
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Sam Pullara
- Re: HTTP router point-of-view concerns Patrick McManus
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns James M Snell
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns James M Snell
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Sam Pullara
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Martin Thomson
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Mark Nottingham
- Re: HTTP router point-of-view concerns Mike Belshe
- Re: HTTP router point-of-view concerns Gábor Molnár
- Re: HTTP router point-of-view concerns Gábor Molnár
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Michael Sweet
- Re: HTTP router point-of-view concerns Christian Parpart
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Patrick McManus
- Re: HTTP router point-of-view concerns Jeff Pinner
- Re: HTTP router point-of-view concerns Martin Thomson
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Ludin, Stephen
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns James M Snell
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Amos Jeffries
- Re: HTTP router point-of-view concerns Roberto Peon
- Re: HTTP router point-of-view concerns Yoav Nir
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Sam Pullara
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Mark Delany
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Yoav Nir
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Yoav Nir
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Stephen Farrell
- Re: HTTP router point-of-view concerns Willy Tarreau
- Re: HTTP router point-of-view concerns Sam Pullara
- Re: HTTP router point-of-view concerns Nicolas Mailhot
- Re: HTTP router point-of-view concerns Nicolas Mailhot
- Re: HTTP router point-of-view concerns Nicolas Mailhot
- Re: HTTP router point-of-view concerns Martin Nilsson
- Re: HTTP router point-of-view concerns Nico Williams
- Re: HTTP router point-of-view concerns Nico Williams
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Nico Williams
- Re: HTTP router point-of-view concerns Poul-Henning Kamp
- Re: HTTP router point-of-view concerns Nico Williams