net/tstun,wgengine/netstack: implement TCP GRO for local services (#13315)
Throughput improves substantially when measured via netstack loopback
(TS_DEBUG_NETSTACK_LOOPBACK_PORT).
Before (d21ebc2):
jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
Test Complete. Summary Results:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 5.77 GBytes 4.95 Gbits/sec 0 sender
[ 5] 0.00-10.01 sec 5.77 GBytes 4.95 Gbits/sec receiver
After:
jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
Test Complete. Summary Results:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 12.7 GBytes 10.9 Gbits/sec 0 sender
[ 5] 0.00-10.00 sec 12.7 GBytes 10.9 Gbits/sec receiver
Updates tailscale/corp#22754
Signed-off-by: Jordan Whited <jordan@tailscale.com>
0926954cf5