Expand stats(3) man page to add a caveat regarding HZ.
Suggested by: thj Sponsored by: Klara Inc, Netflix
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=355307
@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 7, 2019
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.Dd December 2, 2019
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.Dt STATS 3
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.Os
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.Sh NAME
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@ -960,3 +960,9 @@ The
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framework and this manual page were written by
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.An Lawrence Stewart Aq lstewart@FreeBSD.org
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and sponsored by Netflix, Inc.
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.Sh CAVEATS
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Granularity of timing-dependent network statistics, in particular TCP_RTT,
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depends on the
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.Dv HZ
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timer.
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To minimize the measurement error avoid using HZ lower than 1000.
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