ltm rule command TCP rttvar

iRule(1)					  BIG-IP TMSH Manual					     iRule(1)

TCP::rttvar
       Returns TCP's smoothed RTT variance estimate.

SYNOPSIS
       TCP::rttvar

DESCRIPTION
       Returns the Round Trip Time Variance, which is an indication of path jitter. TCP uses this figure, combined
       with RTT, to compute the RTO.

       Note that the value returned is in units of "1/16 of a millisecond". Divide the returned value by 16 to get
       the actual variance in milliseconds.

RETURN VALUE
       The measured RTT variance in units of "1/16 of a millisecond". Divide the returned value by 16 to get the
       actual variance in milliseconds.

VALID DURING
       ANY_EVENT

EXAMPLES
	when CLIENT_CLOSED {
	    # Log rttvar.
	    log local0. "rttvar: [TCP::rttvar]"
	}

HINTS
SEE ALSO
CHANGE LOG
       @BIGIP-12.0.0 --First introduced the command.

BIG-IP						      2020-06-23					     iRule(1)