Date: Thu, 25 Jan 2001 09:27:19 +0900 From: Tatsuhiko Terai <genuine@ma4.justnet.ne.jp> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: freebsd-net@freebsd.org Subject: Re: estimation of RTT,RTO from tcpcb parameter Message-ID: <3A6F72E71D6.7B48GENUINE@ma4.justnet.ne.jp> In-Reply-To: <200101250009.TAA73303@khavrinen.lcs.mit.edu> References: <3A6F67132EE.7B47GENUINE@ma4.justnet.ne.jp> <200101250009.TAA73303@khavrinen.lcs.mit.edu>
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Thanks for your advise. > No. Please take a look at W. Richard Stevens' _TCP/IP Illustrated_ > series, particularly volume 2. > I'll try. > 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. By the way, my running machine is P-III 1GHz with i820 chip and FreeBSD-4.0-RELEASE. Is the length of time tick for this plathome invert of 1GHz? (1/10^-9 [s])? or 10 [ms] (I think it is the time ticks for FreeBSD)? RTT = (tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT) shows sometimes rapidly increase to 40 between ti0 gigabit link. I think 40 * 10 [ms] is too longer for rtt, so I confused.. If there is some information, would you please like toteach ? Thanks- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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