[Bug 272461] Very low throughput mellanox arm64 Azure

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272461

--- Comment #3 from schakrabarti@microsoft.com <schakrabarti@microsoft.com> ---
Some more data points:
From Linux Ubuntu x86 system running  nuttcp -t -T 5 -w 128 -v localhost:
The speed is 32Gbps
root@ubuntu2004:/home/lisatest# nuttcp -t -T 5 -w 128 -v localhost
nuttcp-t: v6.1.2: socket
nuttcp-t: buflen=65536, nstream=1, port=5001 tcp -> localhost
nuttcp-t: time limit = 5.00 seconds
nuttcp-t: connect to 127.0.0.1 with mss=32767, RTT=0.074 ms
nuttcp-t: send window size = 262144, receive window size = 131072
nuttcp-t: available send window = 131072, available receive window = 65536
nuttcp-t: 19626.5625 MB in 5.00 real seconds = 4019455.69 KB/sec = 32927.3810
Mbps
nuttcp-t: retrans = 0
nuttcp-t: 314025 I/O calls, msec/call = 0.02, calls/sec = 62804.00
nuttcp-t: 0.0user 4.9sys 0:05real 99% 0i+0d 926maxrss 0+24pf 109+168csw

nuttcp-r: v6.1.2: socket
nuttcp-r: buflen=65536, nstream=1, port=5001 tcp
nuttcp-r: accept from 127.0.0.1
nuttcp-r: send window size = 2626560, receive window size = 262144
nuttcp-r: available send window = 1313280, available receive window = 131072
nuttcp-r: 19626.5625 MB in 5.00 real seconds = 4019583.51 KB/sec = 32928.4281
Mbps
nuttcp-r: 318597 I/O calls, msec/call = 0.02, calls/sec = 63720.41
nuttcp-r: 0.0user 2.3sys 0:05real 49% 0i+0d 92maxrss 0+18pf 308774+48csw
root@ubuntu2004:/home/lisatest#


Now FreeBSD ARM64:
32Gbps

# nuttcp -t -T 5 -w 128 -v localhost
nuttcp-t: v8.2.2: socket
nuttcp-t: buflen=65536, nstream=1, port=5101 tcp -> localhost
nuttcp-t: time limit = 5.00 seconds
nuttcp-t: connect to 127.0.0.1 with mss=16344, RTT=0.051 ms af=inet
nuttcp-t: send window size = 147096, receive window size = 81720
nuttcp-t: 18235.1250 MB in 5.02 real seconds = 3720201.81 KB/sec = 30475.8932
Mbps
nuttcp-t: host-retrans = 0
nuttcp-t: 291762 I/O calls, msec/call = 0.02, calls/sec = 58128.15
nuttcp-t: 0.0user 4.7sys 0:05real 94% 106i+202d 1200maxrss 0+2pf 18597+0csw

nuttcp-r: v8.2.2: socket
nuttcp-r: buflen=65536, nstream=1, port=5101 tcp
nuttcp-r: accept from 127.0.0.1 with af=inet
nuttcp-r: send window size = 49032, receive window size = 147096
nuttcp-r: 18235.1250 MB in 5.02 real seconds = 3717070.73 KB/sec = 30450.2434
Mbps
nuttcp-r: 332594 I/O calls, msec/call = 0.02, calls/sec = 66207.40
nuttcp-r: 0.0user 4.6sys 0:05real 92% 104i+198d 1172maxrss 0+18pf 32651+0csw
#

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