Something wrong with tcp stack on 13.5

R

robot468

Here are two iperf3 tests run from two bhyve-vm on the same host. Both tests are identical, except that one vm has 13.4 on it, the other has 13.5.

Maybe someone can help figure out the problem?

13.4
Code: 
[  5] local 192.168.6.132 port 21356 connected to 185.170.xxx.xxx port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec  19.8 MBytes   164 Mbits/sec    0   1.60 MBytes       
[  5]   1.01-2.05   sec  32.6 MBytes   263 Mbits/sec    0   1.60 MBytes       
[  5]   2.05-3.02   sec  31.9 MBytes   275 Mbits/sec    3   4.08 KBytes       
[  5]   3.02-4.07   sec  5.12 MBytes  41.0 Mbits/sec   19    413 KBytes       
[  5]   4.07-5.07   sec  3.62 MBytes  30.3 Mbits/sec   78   59.5 KBytes       
[  5]   5.07-6.07   sec  1.25 MBytes  10.5 Mbits/sec    4   42.4 KBytes       
[  5]   6.07-7.05   sec  1.12 MBytes  9.69 Mbits/sec    0   72.4 KBytes       
[  5]   7.05-8.01   sec  1.62 MBytes  14.2 Mbits/sec    0    102 KBytes       
[  5]   8.01-9.07   sec  2.75 MBytes  21.7 Mbits/sec    0    135 KBytes       
[  5]   9.07-10.02  sec  1.62 MBytes  14.4 Mbits/sec  164   36.8 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.02  sec   101 MBytes  84.9 Mbits/sec  268            sender
[  5]   0.00-10.07  sec  99.6 MBytes  83.0 Mbits/sec                  receiver

13.5:
Code: 
[  5] local 192.168.6.129 port 21338 connected to 185.170.xxx.xxx port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.08   sec   768 KBytes  5.82 Mbits/sec    0   45.5 KBytes       
[  5]   1.08-2.07   sec  1.25 MBytes  10.6 Mbits/sec    0   76.9 KBytes       
[  5]   2.07-3.07   sec   896 KBytes  7.38 Mbits/sec    2   31.2 KBytes       
[  5]   3.07-4.07   sec  1.00 MBytes  8.34 Mbits/sec    0   62.6 KBytes       
[  5]   4.07-5.02   sec  1.62 MBytes  14.4 Mbits/sec    0   92.5 KBytes       
[  5]   5.02-6.08   sec  2.25 MBytes  17.9 Mbits/sec    0    122 KBytes       
[  5]   6.08-7.04   sec  1.38 MBytes  12.0 Mbits/sec   19   77.9 KBytes       
[  5]   7.04-8.05   sec   896 KBytes  7.22 Mbits/sec   11   35.5 KBytes       
[  5]   8.05-9.08   sec  1.12 MBytes  9.18 Mbits/sec    0   66.8 KBytes       
[  5]   9.08-10.07  sec   640 KBytes  5.30 Mbits/sec   10   21.3 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.07  sec  11.8 MBytes  9.79 Mbits/sec   42            sender
[  5]   0.00-10.12  sec  11.5 MBytes  9.54 Mbits/sec                  receiver

And here is macos through same internet channel:
Code: 
[  7] local 192.168.1.129 port 62659 connected to 185.170.xxx.xxx port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd          RTT
[  7]   0.00-1.00   sec  14.7 MBytes   123 Mbits/sec    0   3.20 MBytes   60ms     
[  7]   1.00-2.00   sec  26.0 MBytes   218 Mbits/sec    0   3.20 MBytes   66ms     
[  7]   2.00-3.00   sec  27.5 MBytes   230 Mbits/sec    0   3.20 MBytes   53ms     
[  7]   3.00-4.00   sec  16.8 MBytes   141 Mbits/sec  992    824 KBytes   77ms     
[  7]   4.00-5.00   sec  7.21 MBytes  60.5 Mbits/sec  158    440 KBytes   60ms     
[  7]   5.00-6.01   sec  8.34 MBytes  69.6 Mbits/sec    0    467 KBytes   51ms     
[  7]   6.01-7.00   sec  8.63 MBytes  72.7 Mbits/sec    0    483 KBytes   50ms     
[  7]   7.00-8.00   sec  9.14 MBytes  76.8 Mbits/sec    0    490 KBytes   56ms     
[  7]   8.00-9.00   sec  9.28 MBytes  77.8 Mbits/sec    0    491 KBytes   48ms     
[  7]   9.00-10.00  sec  9.15 MBytes  76.8 Mbits/sec    0    504 KBytes   52ms     
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  7]   0.00-10.00  sec   137 MBytes   115 Mbits/sec  1150             sender
[  7]   0.00-10.05  sec   136 MBytes   114 Mbits/sec                  receiver
 
And here linux vm on the same host:

Code: 
[  5] local 192.168.6.133 port 47252 connected to 185.170.xxx.xxx port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  18.0 MBytes   151 Mbits/sec    0   1.55 MBytes      
[  5]   1.00-2.00   sec  34.4 MBytes   288 Mbits/sec    0   1.68 MBytes      
[  5]   2.00-3.00   sec  32.9 MBytes   276 Mbits/sec    0   1.68 MBytes      
[  5]   3.00-4.00   sec  27.8 MBytes   233 Mbits/sec  682   1.18 MBytes      
[  5]   4.00-5.00   sec  27.2 MBytes   228 Mbits/sec    0   1.32 MBytes      
[  5]   5.00-6.00   sec  30.1 MBytes   253 Mbits/sec    0   1.43 MBytes      
[  5]   6.00-7.00   sec  31.5 MBytes   264 Mbits/sec    0   1.52 MBytes      
[  5]   7.00-8.00   sec  32.9 MBytes   276 Mbits/sec    0   1.58 MBytes      
[  5]   8.00-9.00   sec  31.5 MBytes   264 Mbits/sec    0   1.61 MBytes      
[  5]   9.00-10.00  sec  32.8 MBytes   275 Mbits/sec    0   1.61 MBytes      
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   299 MBytes   251 Mbits/sec  682             sender
[  5]   0.00-10.05  sec   297 MBytes   248 Mbits/sec                  receiver

looks very bad((
 
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