ktr.4: Document the debug.ktr.resynchronize sysctl.

diff --git a/share/man/man4/ktr.4 b/share/man/man4/ktr.4
index 2f011d3..e23e145 100644 (file)
--- a/share/man/man4/ktr.4
+++ b/share/man/man4/ktr.4
@@ -167,7 +167,7 @@ output.
 Note that the events are displayed in reverse chronological order.
 That is, the most recent events are displayed first.
 .Sh SYSCTL VARIABLES
-.Bl -tag -width ".Va debug.ktr.*_enable"
+.Bl -tag -width ".Va debug.ktr.resynchronize"
 .It Va debug.ktr.*_enable
 A 32 bit mask used to control event logging.
 Each bit corresponds to one or more events depending on the values of the
@@ -184,6 +184,10 @@ for all corresponding events (i.e.\& setting the sysctl to -1).
 Read only sysctls (one per event) that show the
 .Va debug.ktr.*_enable
 values corresponding to the events.
+.It Va debug.ktr.resynchronize
+Resynchronize the TSC across all CPUs 10 times per second in an attempt to
+reduce drift errors.
+Note that this is very expensive and therefore the default is 0.
 .El
 .Sh SEE ALSO
 .Xr gdb 1 ,