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Date:      Fri, 13 Oct 2000 10:57:10 -0400 (EDT)
From:      Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
To:        Don Lewis <Don.Lewis@tsc.tdk.com>
Cc:        developers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/etc inetd.conf
Message-ID:  <200010131457.KAA55959@khavrinen.lcs.mit.edu>
In-Reply-To: <200010130737.AAA05256@salsa.gv.tsc.tdk.com>
References:  <200010121857.e9CIvAi30686@earth.backplane.com> <Pine.BSF.4.21.0010121438170.17795-100000@dt051n37.san.rr.com> <20001013031655.K37870@jade.chc-chimes.com> <200010130737.AAA05256@salsa.gv.tsc.tdk.com>

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<<On Fri, 13 Oct 2000 00:37:16 -0700, Don Lewis <Don.Lewis@tsc.tdk.com> said:

> In the past there have been widespread deployments of network software
> with example cron entries.  Most users would just configure it to run
> at the default time, and the poor server at the other end would melt
> down.

Just ask anyone who's ever run a POP server for an office full of
Eudora users.  `xload' looks like a veritable sawtooth with those
spikes exactly five minutes apart.

Work done by Lixia Zhang and others has demonstrated that this can and
will happen, in sufficiently large networks, *even in the absence of
synchronized clocks*, because events like this are self-synchronizing.
The only solution is to randomize the interval.

-GAWollman

--
Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu  | O Siem / The fires of freedom 
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick


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