Date: Mon, 14 Jan 2002 11:51:04 -0800 From: David Greenman <dg@root.com> To: Terry Lambert <tlambert2@mindspring.com> Cc: Bosko Milekic <bmilekic@technokratis.com>, "James E. Housley" <jeh@FreeBSD.org>, Thomas Hurst <tom.hurst@clara.net>, arch@FreeBSD.org Subject: Re: 64 bit counters again Message-ID: <20020114115104.C8955@nexus.root.com> In-Reply-To: <3C4334A1.6601C5ED@mindspring.com>; from tlambert2@mindspring.com on Mon, Jan 14, 2002 at 11:42:25AM -0800 References: <Pine.BSF.4.41.0201132057560.62182-100000@prg.traveller.cz> <3C41F3FD.4ECC8CD@mindspring.com> <20020113231459.GA30349@voi.aagh.net> <3C42390A.F9E9F533@mindspring.com> <3C42E899.CB21BD0A@FreeBSD.org> <20020114105859.A24635@technokratis.com> <3C4305E5.65BB32A6@FreeBSD.org> <20020114114911.A24990@technokratis.com> <20020114094738.A8955@nexus.root.com> <3C4334A1.6601C5ED@mindspring.com>
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>Let me tell you that, in the field, he is unlikely to find any >colocation facility with the ability to overflow in under 5 >minutes (two OC3's, full saturated by his one box, are only >100Mbit/S). You *know* this from running the most massive >FTP server on the net for years, right? You are so incredibly naive. Today's colo's use gigabit ethernet. And yes, I am speaking as someone who runs a company that overflows these counters on our servers in less than five minutes and has machines in said colo's connected with gigabit ethernet. Actually, the overflow in 5 minutes problem happens even with a single 155Mbps OC3 circuit...but that's really irrelevant to this discussion. >It's perfectly reasonable to recommend that he keep 1024 byte >precision, while maintaining the same accuracy (e.g. using a >modular byte counter, and conting overflows), which would >amplify his "couple minutes" into 34 hours (he's got a bad >lab setup: he should be able to get full wire speed, even out >of a Tigon II, if he tunes correctly). Um, that still results in a 64bit counter since that's how most 32bit machines do 64bit adds. -DG David Greenman Co-founder, The FreeBSD Project - http://www.freebsd.org President, TeraSolutions, Inc. - http://www.terasolutions.com President, Download Technologies, Inc. - http://www.downloadtech.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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