Date: Thu, 25 Jan 2001 11:36:42 +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: <3A6F913A320.7B49GENUINE@ma4.justnet.ne.jp> In-Reply-To: <200101250133.UAA73836@khavrinen.lcs.mit.edu> References: <3A6F72E71D6.7B48GENUINE@ma4.justnet.ne.jp> <200101250133.UAA73836@khavrinen.lcs.mit.edu>
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Thank you very much for your kindly advise. >The system timer ticks at a rate of 100 Hz on all IA32 processors. (I >believe on Alphas it ticks at 1024 Hz but I may be imagining it.) >Thus, the period is either 10 ms or 0.98 ms. > >In historic versions of FreeBSD, most TCP timers ticked at 2 Hz while >the others ticked at 5 Hz. This was changed in advance of FreeBSD >4.0. I see. Anyway, it seems to be difficult that estimating RTT, RTO within a LAN envirounment (such as Gigabit connection). Of course, this time scale may be valid for general internet envirounment. I'll study more. Thanks - To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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