-Sets the \fBnice\fR(1) level used for \fBovsdb\-server\fR and
-\fBovs\-vswitchd\fR, respectively. Both default to \fB\-10\fR.
+Sets the \fBnice\fR(1) level used for each daemon. All of them
+default to \fB\-10\fR.
+.
+.IP "\fB\-\-ovsdb\-server\-wrapper=\fIwrapper\fR"
+.IQ "\fB\-\-ovs\-vswitchd\-wrapper=\fIwrapper\fR"
+.
+Configures the specified daemon to run under \fIwrapper\fR, which is
+one of the following:
+.
+.RS
+.IP "\fBvalgrind\fR"
+Run the daemon under \fBvalgrind\fR(1), if it is installed, logging to
+\fIdaemon\fB.valgrind.log.\fIpid\fR in the log directory.
+.
+.IP "\fBstrace\fR"
+Run the daemon under \fBstrace\fR(1), if it is installed, logging to
+\fIdaemon\fB.strace.log.\fIpid\fR in the log directory.
+.
+.IP "\fBglibc\fR"
+Enable GNU C library features designed to find memory errors.
+.RE
+.
+.IP
+By default, no wrapper is used.
+.
+.IP
+Each of the wrappers can expose bugs in Open vSwitch that lead to
+incorrect operation, including crashes. The \fBvalgrind\fR and
+\fBstrace\fR wrappers greatly slow daemon operations so they should
+not be used in production. They also produce voluminous logs that can
+quickly fill small disk partitions. The \fBglibc\fR wrapper is less
+resource-intensive but still somewhat slows the daemons.