Date: Wed, 24 Jan 2001 19:09:23 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Tatsuhiko Terai <genuine@ma4.justnet.ne.jp> Cc: freebsd-net@FreeBSD.ORG Subject: Re: estimation of RTT,RTO from tcpcb parameter Message-ID: <200101250009.TAA73303@khavrinen.lcs.mit.edu> In-Reply-To: <3A6F67132EE.7B47GENUINE@ma4.justnet.ne.jp> References: <3A6EFB83208.3FA9GENUINE@ma4.justnet.ne.jp> <3A6F67132EE.7B47GENUINE@ma4.justnet.ne.jp>
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<<On Thu, 25 Jan 2001 08:36:51 +0900, Tatsuhiko Terai <genuine@ma4.justnet.ne.jp> said: > Does this program mean that ? > RTT = (tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT) [ms] > RTO = tp->t_rxtcur [ms] No. Please take a look at W. Richard Stevens' _TCP/IP Illustrated_ series, particularly volume 2. Nothing inside the kernel is measured in milliseconds. TCP parameters are measured in timer ticks, the length of which depends on which version of FreeBSD you are running and (potentially) on what hardware platform. -GAWollman To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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