S 2.35 ke zhiheng-experiment 3 Note-tcp udp simulation -- calculate different CBR parameters: Jitter, throughput, packet loss rate awk code

Calculate the awk code of CBR jitter:

# Measure the end to end delay jitter by the trace file # calculation method: the jitter rate is obtained by dividing the delay time difference of adjacent data packets by the Number Difference of data packets; # jitter = (trecvj-tsndj) -(trecvi-tsndi)/(J-I), j> ibegin {# program initializehighest_packet_id = 0 ;}{ action = $1; time = $2; from = $3; To = $4; type = $5; pktsize = $6; flow_id = $8; src = $9; DST = $10; seq_no = $11; packet_id = $12; # record the current Max packet idif (packet_id> highest_packet_id) highest_pac Ket_id = packet_id; # record the Tx time of packetif (start_time [packet_id] = 0) {pkt_seqno [packet_id] = seq_no; start_time [packet_id] = time ;} # record CBR flow_id = 2 RX timeif (flow_id = 2 & Action! = "D") {If (Action = "R") {end_time [packet_id] = Time ;}} elseend_time [packet_id] =-1 ;} end {# When read over, start to calculatelast_seqno = 0; last_delay = 0; seqno_diff = 0; For (packet_id = 0; packet_id <= highest_packet_id; packet_id ++) {start = start_time [packet_id]; end = end_time [packet_id]; duration = start-end; If (start <End) {# calc jitterseqno_diff = pkt_seqno [packet_id]-last_seqno; delay_diff = duration-last_delay; If (seqno_diff = 0) jitter = 0; elsejitter = delay_diff/seqno_diff; printf ("% F \ n", start, jitter ); last_seqno = pkt_seqno [packet_id]; last_delay = duration ;}}}

Code for calculating the throughput:

# Measure the CBR average throughput by the trace file # throughput = byte CNT/Time Interval # Time Interval = cur_time-start_timebegin {# program initializeinit = 0; I = 0 ;} {Action = $1; time = $2; from = $3; To = $4; type = $5; pktsize = $6; flow_id = $8; src = $9; DST = $10; seq_no = $11; packet_id = $12; if (Action = "R" & from = 2 & to = 3 & flow_id = 2) {pkt_byte_sum [I + 1] = pkt_byte_sum [I] + pktsize; If (init = 0) {start_time = time; init = 1;} end_time [I] = time; I = I + 1 ;}}end {# when read over, start to calculateprintf ("%. 2f \ t %. 2f \ n ", end_time [0], 0); For (j = 1; j <I; j ++) {# average throughput from the beginning to the current, instead of the current instantaneous throughput # This calculation seems inaccurate. Th = pkt_byte_sum [J]/(end_time [J]-start_time) * 8/1000; printf ("%. 2f \ t %. 2f \ n ", end_time [J], th) ;}# the first and last values are set to 0 to make a good picture, the last 0 seems a bit inappropriate # printf ("%. 2f \ t %. 2f \ n ", end_time [0], 0 );}

Calculate packet loss rate:

# Measure the CBR packet loss rate by the trace fileBEGIN{# program initializefsDrops = 0;numFs = 0;}{action = $1;time = $2;from = $3;to = $4;type = $5;pktsize = $6;flow_id = $8;src = $9;dst = $10;seq_no = $11;packet_id = $12;# Record how many packets sent from n1if ( from==1 && to==2 && action=="+" )numFs++;# Record flow_id is 2 and droppedif ( flow_id==2 && action=="d" )fsDrops++;}END {# When read over, start to calculateprintf("number of pkts sent:%d, lost:%d, loss rate:%f\n", numFs,fsDrops,fsDrops/numFs);}

Number of Pkts Sent: 550, lost: 8, Loss Rate: 0.014545