Date: Thu, 25 Jan 2001 00:57:55 +0900 From: Tatsuhiko Terai <genuine@ma4.justnet.ne.jp> To: freebsd-net@FreeBSD.ORG Cc: genuine@ma4.justnet.ne.jp Subject: estimation of RTT,RTO from tcpcb parameter Message-ID: <3A6EFB83208.3FA9GENUINE@ma4.justnet.ne.jp>
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(This mail is the multi-post to freebsd-net-jp. I'm sorry for the person who receives the duplicate mail.) I have a question about the estimation RTT, RTO using the information in tcpcb (t_srtt, t_rttvar). I'm trying to estimate network status at the kernel level using tcpcb information, obtain the estimation of RTT, RTO. I know that UNIX is not allowed floating point calculation in the kernel, so RTT estimator is implemented as using int. However, I don't know the method of calculation of the now RTT, RTO using t_srtt, t_rttvar in kernel tcpcb and so on. I hope that it is useful that I obtain the [ms]-order RTT,RTO >from that parameter. If there is an information about this, or anyone know the way of calculation, please teach me. Thanks. Tatsuhiko. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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