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Jordan Whited 6a84778f2c conn, device: use UDP GSO and GRO on Linux 
StdNetBind probes for UDP GSO and GRO support at runtime. UDP GSO is
dependent on checksum offload support on the egress netdev. UDP GSO
will be disabled in the event sendmmsg() returns EIO, which is a strong
signal that the egress netdev does not support checksum offload.

The iperf3 results below demonstrate the effect of this commit between
two Linux computers with i5-12400 CPUs. There is roughly ~13us of round
trip latency between them.

The first result is from commit 052af4a without UDP GSO or GRO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-10.00  sec  9.85 GBytes  8.46 Gbits/sec  1139   3.01 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  9.85 GBytes  8.46 Gbits/sec  1139  sender
[  5]   0.00-10.04  sec  9.85 GBytes  8.42 Gbits/sec        receiver

The second result is with UDP GSO and GRO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-10.00  sec  12.3 GBytes  10.6 Gbits/sec  232   3.15 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  12.3 GBytes  10.6 Gbits/sec  232   sender
[  5]   0.00-10.04  sec  12.3 GBytes  10.6 Gbits/sec        receiver

Reviewed-by: Adrian Dewhurst <adrian@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-10-10 15:07:36 +02:00
..
bindtest global: buff -> buf 2023-03-13 17:55:53 +01:00
winrio global: bump copyright year 2023-02-07 20:39:29 -03:00
bind_std_test.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
bind_std.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
bind_windows.go conn: windows: add missing return statement in DstToString AF_INET 2023-06-27 18:02:50 +02:00
boundif_android.go conn, device, tun: implement vectorized I/O on Linux 2023-03-10 14:52:17 +01:00
conn_test.go global: buff -> buf 2023-03-13 17:55:53 +01:00
conn.go global: buff -> buf 2023-03-13 17:55:53 +01:00
control_default.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
control_linux_test.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
control_linux.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
controlfns_linux.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
controlfns_unix.go all: adjust build tags for wasip1/wasm 2023-07-04 15:54:42 +02:00
controlfns_windows.go conn: set SO_{SND,RCV}BUF to 7MB on the Bind UDP socket 2023-03-10 14:52:20 +01:00
controlfns.go conn: set SO_{SND,RCV}BUF to 7MB on the Bind UDP socket 2023-03-10 14:52:20 +01:00
default.go conn, device, tun: implement vectorized I/O on Linux 2023-03-10 14:52:17 +01:00
errors_default.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
errors_linux.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
features_default.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
features_linux.go conn, device: use UDP GSO and GRO on Linux 2023-10-10 15:07:36 +02:00
mark_default.go conn, device, tun: implement vectorized I/O on Linux 2023-03-10 14:52:17 +01:00
mark_unix.go conn, device, tun: implement vectorized I/O on Linux 2023-03-10 14:52:17 +01:00