Date: Mon, 14 Jan 2002 11:45:33 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: David Greenman <dg@root.com> Cc: "James E. Housley" <jeh@FreeBSD.org>, Thomas Hurst <tom.hurst@clara.net>, arch@FreeBSD.org Subject: Re: 64 bit counters again Message-ID: <3C43355D.8C9A35A0@mindspring.com> 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> <3C431EE5.1CFF557B@mindspring.com> <20020114100633.B8955@nexus.root.com>
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David Greenman wrote: > >Actually, I was thinking that if what you are counting overflowed > >in such a short period of time, then you are counting the wrong > >thing. > > > >Instead of bytes, try counting K or frames, instead of frames, > >count packets, etc.. > > Kbytes doesn't have enough resolution to provide accurate results since > the packets themselves are not integer multiples of Kbytes. Use a modular counter; count bytes, and reflect them out at 1K boundaries. Thus the accuracy is 1K, but the precision is 1 byte. I have a hard time beliving he needs 1 byte accuracy for the amount of data he is pushing. Accounting records could not be written to disk fast enough. > >You still haven't told us exactly what counter is overflowing... > > He's just trying to do what every network admin is trying to do: measure > link utilization (mostly bits per second) so that he can make intelligent > decisions about capacity, use, and associated costs. OK, he can do that with 1 byte precision, and 1K (or 1M) accuracy, so it's no problem... -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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