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Date: Thu, 4 Dec 2008 20:05:22 +0100 From: "Saverio Mascolo" <saverio.mascolo@...il.com> To: "David Miller" <davem@...emloft.net> Cc: ldecicco@...il.com, ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org Subject: Re: TCP default congestion control in linux should be newreno dear david, we have done many experiments, along with many other "researcher" as u say. as a consequence, i have maturated the belief that changing the probing phase of the van jacobson TCP, which is linear, could not be not a wise thing . the rationale of VJ choice seems simple to me: if the window is increased of one packet in one rtt, i can drop at most one packet in one rtt and so i have to recover only one packet in one rtt (note that rtt is the feedback reaction time). If cwnd is increased of N packets i could drop N packets and i could need to recover N pkts. this is the problem here. window dynamics of newreno cwnd behave better, they are smoother. others cwnd seem chaotic. if you have other experimental results showing the opposite, please let me know. thanks, saverio On Thu, Dec 4, 2008 at 7:18 PM, David Miller <davem@...emloft.net> wrote: > From: Luca De Cicco <ldecicco@...il.com> > Date: Thu, 4 Dec 2008 18:50:22 +0100 > >> Thank you for pointing out, we employed the kernel 2.6.24 with web100 > > That is so ancient, especially TCP wise, it isn't even funny. > > And using the web100 patch adds yet more variables to the equation. > > It doesn't really reflect what users are actually running in the world > today, not by a country mile. > > You're not comparing what we're actually shipping in the kernel.org > kernel at all with your tests, which means your tests and results are > something close to useless for us. > > I don't udnerstand why there are so many people who dice up their > kernels, or use very old kernels, then do some "research" and then > suggest we should change this or that with the kernel.org kernel as a > result. > > Sorry, nobody here is going to take that seriously at all. > -- Prof. Saverio Mascolo Dipartimento di Elettrotecnica ed Elettronica Politecnico di Bari Via Orabona 4 70125 Bari Italy Tel. +39 080 5963621 Fax. +39 080 5963410 email:mascolo@...iba.it http://www-dee.poliba.it/dee-web/Personale/mascolo.html ================================= This message may contain confidential and/or legally privileged information. If you are not the intended recipient of the message, please destroy it. Any unauthorized dissemination, distribution, or copying of the material in this message, and any attachments to the message, is strictly forbidden. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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