ntp/ntpd/ntp_proto.c

101 	double		error;	/* jitter */
102 	double		seljit;	/* selection jitter */
150 double	sys_jitter;		/* system jitter */
2843 	 *  p.psi       is the PollProc's jitter
3190 	peer->jitter = LOGTOD(sys_precision);
3332 	 * further improve the jitter estimate, of the remainder leave
3334 	 * least two samples for jitter calculation.
3346 	 * Compute the dispersion and jitter. The dispersion is weighted
3348 	 * to 1.0. The jitter is the RMS differences relative to the
3351 	peer->disp = peer->jitter = 0;
3358 			peer->jitter += DIFF(peer->filter_offset[j],
3365 	 * save the offset, delay and jitter. Note the jitter must not
3376 		peer->jitter /= m - 1;
3377 	peer->jitter = max(SQRT(peer->jitter), LOGTOD(sys_precision));
3382 	 * (3) times the jitter and the interval between them is less
3388 	    && etemp > CLOCK_SGATE * peer->jitter
3416 	    peer->offset, peer->delay, peer->disp, peer->jitter);
3419 		    peer->jitter));
3602 		peers[nlist].error = peer->jitter;
3780 	 * Now, vote outliers off the island by select jitter weighted
3782 	 * than sys_minclock survivors and the select jitter of the peer
3784 	 * jitter. Stop if we are about to discard a TRUE or PREFER
3835 	 * selection jitter scaled by the root distance augmented by
3912 	 * there is a prefer peer, use its offset and jitter.
3913 	 * Otherwise, use the combined offset and jitter of all kitters.
3924 			sys_jitter = typesystem->jitter;
3926 		DPRINTF(1, ("select: combine offset %.9f jitter %.9f\n",
3933 	 * and jitter. However, if this is the atom driver, use it only
3947 		sys_jitter = typesystem->jitter;
3948 		DPRINTF(1, ("select: pps offset %.9f jitter %.9f\n",
4042 		+ peer->jitter;