Date: Wed, 29 Jan 2014 14:41:13 -0800 From: Colin Percival <cperciva@freebsd.org> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-current <freebsd-current@freebsd.org>, Lars Engels <lars.engels@0x20.net> Subject: Re: freebsd-update Message-ID: <52E98389.2050404@freebsd.org> In-Reply-To: <CAJ-Vmok0YWPaipH9_3wxwei6yH33fa2LHhn=RB_7XDHgy%2Bof_Q@mail.gmail.com> References: <lblts0$9o1$1@ger.gmane.org> <CAJ5UdcO6V_YnyoJSA=JRL_D7vFzZ8yXcKnh2QcjNQDskbpE98w@mail.gmail.com> <5F09668C-0DEA-4074-A06C-BC4D29F92368@FreeBSD.org> <201401211149.45793.jhb@freebsd.org> <CAN6yY1uiNcWPuJL=O6osDhZci_YBXe7tRW0Nt_cUy25cCTbALQ@mail.gmail.com> <52E2C1BC.10202@allanjude.com> <20140125113236.GX86491@e-new.0x20.net> <1390662664.13404.75208481.39F16B29@webmail.messagingengine.com> <20140129205157.GB86491@e-new.0x20.net> <52E977FB.8020105@freebsd.org> <CAJ-Vmok0YWPaipH9_3wxwei6yH33fa2LHhn=RB_7XDHgy%2Bof_Q@mail.gmail.com>
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On 01/29/14 14:26, Adrian Chadd wrote: > On 29 January 2014 13:51, Colin Percival <cperciva@freebsd.org> wrote: >> FWIW, the performance problems with proxies are limited to HTTP proxies >> which don't speak HTTP/1.1. > > Did you / others ever actually benchmark this? The fact that performance sucks when proxies break HTTP pipelining? Yes, but it's also implied by the RTT/request limit for non-pipelined requests. > I know that Squid supports pipelined requests but only a handful > (defaulting to 1) at a time, as the actual error semantics for > HTTP/1.1 pipelining wasn't well defined. I'm not sure what the poorly defined error semantics are, but I suppose that doesn't matter. Does Squid now reply with HTTP/1.1 headers? The phttpget code won't even try to pipeline requests unless it sees that -- as required by the HTTP specification. > So flipping it around - which intermediaries that are actually in use > by companies and such actually support pipelining at the level that > you're doing it? I don't know. People usually don't tell me when things work. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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