From 733144d91dee1e12fe01505fde0eede9f46b75c4 Mon Sep 17 00:00:00 2001
From: Sheldon Hearn <sheldonh@FreeBSD.org>
Date: Wed, 26 Jul 2000 08:51:58 +0000
Subject: [PATCH] Describe the syncer(4)-related sysctls kern.filedelay,
 kern.dirdelay and kern.metadelay, thanks to mckusick's feedback.

---
 sbin/sysctl/sysctl.8    |  4 +++-
 share/man/man4/syncer.4 | 18 +++++++++++++-----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/sbin/sysctl/sysctl.8 b/sbin/sysctl/sysctl.8
index 0187640e395..d50b23e42df 100644
--- a/sbin/sysctl/sysctl.8
+++ b/sbin/sysctl/sysctl.8
@@ -138,7 +138,9 @@ privilege can change the value.
 .It kern.saved_ids	integer	no
 .It kern.boottime	struct	no
 .It kern.domainname	string	yes
-.It kern.update	integer	yes
+.It kern.filedelay	integer	yes
+.It kern.dirdelay	integer	yes
+.It kern.metadelay	integer	yes
 .It kern.osreldate	string	no
 .It kern.bootfile	string	yes
 .It kern.corefile	string	yes
diff --git a/share/man/man4/syncer.4 b/share/man/man4/syncer.4
index 27ece74ac04..95f2246df19 100644
--- a/share/man/man4/syncer.4
+++ b/share/man/man4/syncer.4
@@ -53,14 +53,22 @@ the
 .Nm
 process forces a write out to disk of its dirty buffers.
 .Pp
-Usually,
-buffers will be written out no more than
-about 30 seconds
-after they are dirtied.
+The usual delay between the time buffers are dirtied
+and the time they are synced
+is controlled by the following
+.Xr sysctl 8
+tunable variables:
+.Bl -column "filedelayXXXX" "DefaultXX" "DescriptionXX"
+.It Em Variable Ta Em Default Ta Em Description
+.It Va kern.filedelay Ta 30 Ta "time to delay syncing files"
+.It Va kern.dirdelay Ta 29 Ta "time to delay syncing directories"
+.It Va kern.metadelay Ta 28 Ta "time to delay syncing metadata"
+.El
 .Sh SEE ALSO
 .Xr sync 2 ,
 .Xr fsck 8 ,
-.Xr sync 8
+.Xr sync 8 ,
+.Xr sysctl 8
 .Sh HISTORY
 The
 .Nm