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Expand stats(3) man page to add a caveat regarding HZ.

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Suggested by:	thj
Sponsored by:	Klara Inc, Netflix
This commit is contained in:
Edward Tomasz Napierala 2019-12-02 21:03:09 +00:00
parent adc56f5a38
commit 359d7273f5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355307
1 changed files with 7 additions and 1 deletions
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share/man/man3/stats.3
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 7, 2019
.Dd December 2, 2019
.Dt STATS 3
.Os
.Sh NAME
@ -960,3 +960,9 @@ The
framework and this manual page were written by
.An Lawrence Stewart Aq lstewart@FreeBSD.org
and sponsored by Netflix, Inc.
.Sh CAVEATS
Granularity of timing-dependent network statistics, in particular TCP_RTT,
depends on the
.Dv HZ
timer.
To minimize the measurement error avoid using HZ lower than 1000.