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Date: Wed, 18 Oct 2023 15:10:09 -0700 From: rjmcmahon <rjmcmahon@...cmahon.com> To: Netdev <netdev@...r.kernel.org> Subject: iperf 2 & clock unsync detection Hi all, One can use the bounceback test to check if the clock's are not synchronized relative to the bb time. (you'll need to compile the latest iperf from master to get this https://sourceforge.net/projects/iperf2/ Below is an example: root@...pberrypi:/usr/local/src/iperf2-code# iperf -c 192.168.1.33 -e -i 1 --trip-times --bounceback --bounceback-period 0 ------------------------------------------------------------ Client connecting to 192.168.1.33, TCP port 5001 with pid 38489 (1/0 flows/load) Bounceback test (req/reply size = 100 Byte/ 100 Byte) (server hold req=0 usecs & tcp_quickack) TCP congestion control using cubic TOS set to 0x0 and nodelay (Nagle off) TCP window size: 85.0 KByte (default) Event based writes (pending queue watermark at 16384 bytes) ------------------------------------------------------------ [ 1] local 192.168.1.32%eth0 port 42258 connected with 192.168.1.33 port 5001 (prefetch=16384) (bb w/quickack req/reply/hold=100/100/0) (trip-times) (sock=3) (icwnd/mss/irtt=14/1448/265) (ct=0.43 ms) on 2023-10-18 14:49:24.047 (PDT) [ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd/RTT RPS(avg) [ 1] 0.00-1.00 sec 998 KBytes 8.18 Mbits/sec 10223=0.093/0.078/1.057/0.027 ms 0 14K/62 us 10729 rps [ 1] 1.00-2.00 sec 1.06 MBytes 8.93 Mbits/sec 11166=0.086/0.077/0.225/0.003 ms 0 14K/61 us 11631 rps [ 1] 2.00-3.00 sec 1.07 MBytes 8.94 Mbits/sec 11172=0.086/0.077/0.434/0.004 ms 0 14K/60 us 11633 rps [ 1] 3.00-4.00 sec 1.06 MBytes 8.87 Mbits/sec 11092=0.087/0.079/0.376/0.005 ms 0 14K/62 us 11547 rps [ 1] 4.00-5.00 sec 979 KBytes 8.02 Mbits/sec 10025=0.096/0.090/0.442/0.004 ms 0 14K/61 us 10402 rps [ 1] 5.00-6.00 sec 960 KBytes 7.86 Mbits/sec 9831=0.098/0.090/0.413/0.008 ms 0 14K/61 us 10213 rps [ 1] 6.00-7.00 sec 984 KBytes 8.06 Mbits/sec 10080=0.096/0.090/0.150/0.002 ms 0 14K/61 us 10461 rps [ 1] 7.00-8.00 sec 983 KBytes 8.06 Mbits/sec 10070=0.096/0.090/0.168/0.002 ms 0 14K/61 us 10452 rps [ 1] 8.00-9.00 sec 984 KBytes 8.06 Mbits/sec 10074=0.096/0.092/0.149/0.002 ms 0 14K/61 us 10455 rps [ 1] 9.00-10.00 sec 982 KBytes 8.04 Mbits/sec 10056=0.096/0.087/0.446/0.004 ms 0 14K/64 us 10434 rps [ 1] 0.00-10.01 sec 9.90 MBytes 8.29 Mbits/sec 103791=0.093/0.077/1.057/0.011 ms 0 14K/1729 us 10795 rps [ 1] 0.00-10.01 sec OWD (ms) Cnt=103791 TX=0.770/-0.357/4.012/1.683 RX=-0.678/-3.709/0.789/1.686 Asymmetry=2.299/0.001/7.702/2.857 [ 1] 0.00-10.01 sec OWD-TX-PDF: bin(w=100us):cnt(103791)=1:14920,2:263,3:275,4:271,5:273,6:272,7:272,8:272,9:271,10:272,11:270,12:275,13:273,14:272,15:269,16:272,17:272,18:272,19:272,20:273,21:271,22:269,23:273,24:271,25:272,26:273,27:273,28:270,29:272,30:271,31:272,32:271,33:273,34:270,35:271,36:272,37:269,38:20475,39:625,40:2,41:1 (5.00/95.00/99.7%=1/100000/100000,Outliers=0,obl/obu=57994/0) [ 1] 0.00-10.01 sec OWD-RX-PDF: bin(w=100us):cnt(103791)=1:12175,2:3139,3:3132,4:3136,5:51552,6:5,8:2 (5.00/95.00/99.7%=1/100000/100000,Outliers=0,obl/obu=30650/0) [ 1] 0.00-10.01 sec BB8-PDF: bin(w=100us):cnt(103791)=1:100388,2:3136,3:258,4:4,5:4,11:1 (5.00/95.00/99.7%=1/1/2,Outliers=0,obl/obu=0/0) [ 1] 0.00-10.01 sec Clock sync error count = 92028 Below is an example where the clock are sync'd - there is no Clock sync error count message root@...pberrypi:/usr/local/src/iperf2-code# iperf -c 192.168.1.33 -e -i 1 --trip-times --bounceback --bounceback-period 0 ------------------------------------------------------------ Client connecting to 192.168.1.33, TCP port 5001 with pid 38492 (1/0 flows/load) Bounceback test (req/reply size = 100 Byte/ 100 Byte) (server hold req=0 usecs & tcp_quickack) TCP congestion control using cubic TOS set to 0x0 and nodelay (Nagle off) TCP window size: 85.0 KByte (default) Event based writes (pending queue watermark at 16384 bytes) ------------------------------------------------------------ [ 1] local 192.168.1.32%eth0 port 46112 connected with 192.168.1.33 port 5001 (prefetch=16384) (bb w/quickack req/reply/hold=100/100/0) (trip-times) (sock=3) (icwnd/mss/irtt=14/1448/291) (ct=0.46 ms) on 2023-10-18 14:51:27.555 (PDT) [ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd/RTT RPS(avg) [ 1] 0.00-1.00 sec 1003 KBytes 8.22 Mbits/sec 10270=0.093/0.079/1.218/0.025 ms 0 14K/61 us 10775 rps [ 1] 1.00-2.00 sec 1.06 MBytes 8.93 Mbits/sec 11166=0.086/0.078/0.322/0.005 ms 0 14K/60 us 11628 rps [ 1] 2.00-3.00 sec 1.07 MBytes 8.94 Mbits/sec 11175=0.086/0.078/0.263/0.003 ms 0 14K/61 us 11635 rps [ 1] 3.00-4.00 sec 1.06 MBytes 8.93 Mbits/sec 11167=0.086/0.078/0.313/0.004 ms 0 14K/60 us 11630 rps [ 1] 4.00-5.00 sec 998 KBytes 8.18 Mbits/sec 10224=0.094/0.080/0.410/0.006 ms 0 14K/62 us 10614 rps [ 1] 5.00-6.00 sec 958 KBytes 7.85 Mbits/sec 9811=0.098/0.088/0.432/0.009 ms 0 14K/61 us 10187 rps [ 1] 6.00-7.00 sec 982 KBytes 8.05 Mbits/sec 10060=0.096/0.090/0.306/0.003 ms 0 14K/61 us 10437 rps [ 1] 7.00-8.00 sec 980 KBytes 8.03 Mbits/sec 10035=0.096/0.090/0.927/0.015 ms 0 14K/61 us 10409 rps [ 1] 8.00-9.00 sec 981 KBytes 8.04 Mbits/sec 10048=0.096/0.090/0.763/0.010 ms 0 14K/61 us 10424 rps [ 1] 9.00-10.00 sec 982 KBytes 8.04 Mbits/sec 10054=0.096/0.092/0.287/0.003 ms 0 14K/61 us 10432 rps [ 1] 0.00-10.01 sec 9.92 MBytes 8.31 Mbits/sec 104011=0.092/0.078/1.218/0.012 ms 0 14K/1009 us 10816 rps [ 1] 0.00-10.01 sec OWD (ms) Cnt=104011 TX=0.040/0.030/0.680/0.005 RX=0.053/0.045/0.887/0.008 Asymmetry=0.013/0.000/0.847/0.006 [ 1] 0.00-10.01 sec OWD-TX-PDF: bin(w=100us):cnt(104011)=1:103967,2:31,3:9,4:2,6:1,7:1 (5.00/95.00/99.7%=1/1/1,Outliers=0,obl/obu=0/0) [ 1] 0.00-10.01 sec OWD-RX-PDF: bin(w=100us):cnt(104011)=1:103769,2:226,3:13,4:1,8:1,9:1 (5.00/95.00/99.7%=1/1/1,Outliers=0,obl/obu=0/0) [ 1] 0.00-10.01 sec BB8-PDF: bin(w=100us):cnt(104011)=1:100646,2:3146,3:198,4:10,5:4,6:1,7:1,8:2,10:2,13:1 (5.00/95.00/99.7%=1/1/2,Outliers=0,obl/obu=0/0) Bob
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