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Date: Sun, 21 Feb 2010 11:21:03 +0100 From: Pavel Machek <pavel@....cz> To: Andreas Petlund <apetlund@...ula.no> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>, Eric Dumazet <eric.dumazet@...il.com>, Arnd Hannemann <hannemann@...s.rwth-aachen.de>, LKML <linux-kernel@...r.kernel.org>, shemminger@...tta.com, David Miller <davem@...emloft.net>, william.allen.simpson@...il.com, damian@....rwth-aachen.de, "Eric W. Biederman" <ebiederm@...ssion.com> Subject: Re: [net-next PATCH v4 1/3] net: TCP thin-stream detection Hi! > +After analysing a large number of time-dependent interactive > +applications, we have seen that they often produce thin streams > +and also stay with this traffic pattern throughout its entire > +lifespan. The combination of time-dependency and the fact that the > +streams provoke high latencies when using TCP is unfortunate. > + > +In order to reduce application-layer latency when packets are lost, > +a set of mechanisms has been made, which address these latency issues > +for thin streams. In short, if the kernel detects a thin stream, > +the retransmission mechanisms are modified in the following manner: > + > +1) If the stream is thin, fast retransmit on the first dupACK. > +2) If the stream is thin, do not apply exponential backoff. 2) seems very dangerous/unfair. If network congestion is caused just by thin streams, will the network just fall apart? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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