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Date: Thu, 19 May 2011 09:40:09 -0700 From: tsuna <tsunanet@...il.com> To: Hagen Paul Pfeifer <hagen@...u.net> Cc: Alexander Zimmermann <alexander.zimmermann@...sys.rwth-aachen.de>, David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net, eric.dumazet@...il.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02. On Thu, May 19, 2011 at 1:02 AM, Hagen Paul Pfeifer <hagen@...u.net> wrote: > So yes, it CAN be wise to choose other lower/upper bounds. But keep in > mind that we should NOT artificial limit ourself. I can image data center > scenarios where a initial RTO of <1 match perfectly. Yes that's exactly the point I was trying to make when talking to Alexander offline. On today's Internet, RTTs are easily in the hundreds of ms, and initRTO is 3s, so there's 2 orders of magnitude of difference. In my environment, if my RTT is ~2µs, an initRTO of 200ms means that there's a gap of 6 orders of magnitude (!). And yes, although I don't work for High Frequency Trading companies in Wall Street, I'm already buying switches full of line-rate 10Gb ports with a port-to-port latency of 500ns for L2/L3 forwarding/switching. I expect this kind of network gear will quickly become prevalent in datacenter/backend environments. -- Benoit "tsuna" Sigoure Software Engineer @ www.StumbleUpon.com -- 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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