svn commit: r355307 - head/share/man/man3
Edward Tomasz Napierala
trasz at FreeBSD.org
Mon Dec 2 21:03:10 UTC 2019
Author: trasz
Date: Mon Dec 2 21:03:09 2019
New Revision: 355307
URL: https://svnweb.freebsd.org/changeset/base/355307
Log:
Expand stats(3) man page to add a caveat regarding HZ.
Suggested by: thj
Sponsored by: Klara Inc, Netflix
Modified:
head/share/man/man3/stats.3
Modified: head/share/man/man3/stats.3
==============================================================================
--- head/share/man/man3/stats.3 Mon Dec 2 21:00:29 2019 (r355306)
+++ head/share/man/man3/stats.3 Mon Dec 2 21:03:09 2019 (r355307)
@@ -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 at 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.
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