From owner-freebsd-arch  Mon Jan 14 12: 6: 5 2002
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Date: Mon, 14 Jan 2002 11:54:33 -0800
From: David Greenman <dg@root.com>
To: "James E. Housley" <jeh@FreeBSD.org>
Cc: Terry Lambert <tlambert2@mindspring.com>,
	Bosko Milekic <bmilekic@technokratis.com>,
	Thomas Hurst <tom.hurst@clara.net>, arch@FreeBSD.org
Subject: Re: 64 bit counters again
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References: <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> <3C4338EA.1D698EF1@FreeBSD.org>
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>That sounds reasonable.  1024 might be a problem becuase of smaller ACK
>or setup packets, but the concept is reasonable.  I would like to know
>the amount of data transmitted and received because that is what we are
>billed on.  And at that datarate, to the bit accuracy is crazy.  But the
>results should be close enough to reality to be able to trust it with a
>small fudge fact for saftey.

   It's not reasonable because most packets are either small (40 bytes)
or MTU sized. The distribution of sizes is not random and keeping only
1K internal precision would not result in anything near accurate in terms
of bps.

-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.

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