Improve GPRC performance with optimised configs for client and server

[balajiv113]

GRPC

-----------------------------------------------------------
Server listening on 5201 (test #1)
-----------------------------------------------------------
Accepted connection from ::1, port 39068
[  5] local ::1 port 5201 connected to ::1 port 39078
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   412 MBytes  3.46 Gbits/sec                  
[  5]   1.00-2.00   sec   439 MBytes  3.68 Gbits/sec                  
[  5]   2.00-3.00   sec   438 MBytes  3.68 Gbits/sec                  
[  5]   3.00-4.00   sec   435 MBytes  3.65 Gbits/sec                  
[  5]   4.00-5.00   sec   428 MBytes  3.59 Gbits/sec                  
[  5]   5.00-6.00   sec   436 MBytes  3.66 Gbits/sec                  
[  5]   6.00-7.00   sec   428 MBytes  3.59 Gbits/sec                  
[  5]   7.00-8.00   sec   423 MBytes  3.55 Gbits/sec                  
[  5]   8.00-9.00   sec   418 MBytes  3.51 Gbits/sec                  
[  5]   9.00-10.00  sec   428 MBytes  3.59 Gbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec  4.18 GBytes  3.59 Gbits/sec                  receiver

SSH with vsock

-----------------------------------------------------------
Server listening on 5201 (test #1)
-----------------------------------------------------------
Accepted connection from ::1, port 42904
[  5] local ::1 port 5201 connected to ::1 port 42920
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   418 MBytes  3.51 Gbits/sec                  
[  5]   1.00-2.00   sec   436 MBytes  3.66 Gbits/sec                  
[  5]   2.00-3.00   sec   440 MBytes  3.69 Gbits/sec                  
[  5]   3.00-4.00   sec   384 MBytes  3.22 Gbits/sec                  
[  5]   4.00-5.00   sec   372 MBytes  3.12 Gbits/sec                  
[  5]   5.00-6.00   sec   434 MBytes  3.64 Gbits/sec                  
[  5]   6.00-7.00   sec   438 MBytes  3.68 Gbits/sec                  
[  5]   7.00-8.00   sec   443 MBytes  3.72 Gbits/sec                  
[  5]   8.00-9.00   sec   443 MBytes  3.72 Gbits/sec                  
[  5]   9.00-10.00  sec   442 MBytes  3.71 Gbits/sec                  
[  5]  10.00-10.00  sec  1.62 MBytes  3.83 Gbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec  4.15 GBytes  3.57 Gbits/sec                  receiver

Aimed to bridge the performance gap between GRPC and SSH with VSOCK.

[AkihiroSuda]

Thanks, but SSH w/ VSOCK seems still faster for me (M4 Max, macOS 26.0.1)

gRPC

• TCP: 5.83 Gbps
• TCP Reverse: 6.98 Gbps

SSH w/ VSOCK:

• TCP: 6.05 Gbps
• TCP Reverse: 7.53 Gbps