From: David Presotto <presotto@closedmind.org>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] timesync is slow to set the time after boot
Date: Sun, 16 Mar 2003 08:28:19 -0500 [thread overview]
Message-ID: <1d8097739572ba276fa5000f1a77ebc0@plan9.bell-labs.com> (raw)
In-Reply-To: <3E7432B3.2050805@powell.name>
No, it was just trying to get any system startup effects out of the
measurement. It just mattered for ntp round trip, not for the real
time clock. For NTP there's an assumption that the round trip time
twixt the systems is equally separated in the two directions. When
the system is coming up, especially on diskless systems, the ether
can stay pretty busy for seconds after the boot as different things
page in, db's get read, etc. Dropping the first sample was just an
attempt to avoid that since most of our systems (except our web
server) have settled after a minute.
However, I booted our systems here a few dozen times since then and
looked at the time convergence. It doesn't seem to make a difference
either way so the check stays out.
prev parent reply other threads:[~2003-03-16 13:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-15 6:48 Richard Powell
2003-03-15 12:49 ` David Presotto
2003-03-15 18:00 ` David Presotto
2003-03-16 8:15 ` Richard Powell
2003-03-16 13:28 ` David Presotto [this message]
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