Date: Thu, 09 Sep 2004 08:31:31 +0900 From: "George V. Neville-Neil" <gnn@neville-neil.com> To: Julian Elischer <julian@elischer.org> Cc: net@freebsd.org Subject: Re: [Fwd: TCP RTO] Message-ID: <m2k6v4nxrg.wl@minion.local.neville-neil.com> In-Reply-To: <413F54EE.1020700@elischer.org> References: <413F54EE.1020700@elischer.org>
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At Wed, 08 Sep 2004 11:52:30 -0700, julian wrote: > My curiosity is if we see the tcp.cc code inside, tcp.cc ? That's not a kernel file. > there are two different version of srtt (smoothed rtt) and rttvar > (smoothed mean deviation estimator). The one is simply 'srtt' and > 'rttvar' and the other is 't_srtt' and 't_rttvar'. The unit of > t_srtt is 'ticks * 8' and the unit of t_rttvar is 'ticks * 4'. In -CURRENT, and I would suspect most recent versions of FreeBSD, the only variables I find are t_srtt and t_rttvar which are used as fixed point values. srtt and rttvar were variables used in the older (BSD 4.4?) code. I believe they were documented in Steven's TCP/IP Illustrated Volume 2 but I don't have my copy here so I can't check. Later, George
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