Changes TCP packet dispatch to use a pool of goroutines.

All inbound segments for connections in ESTABLISHED state are delivered to the
endpoint's queue but for every segment delivered we also queue the endpoint for
processing to a selected processor. This ensures that when there are a large
number of connections in ESTABLISHED state the inbound packets are all handled
by a small number of goroutines and significantly reduces the amount of work the
goscheduler has to perform.

We let connections in other states follow the current path where the
endpoint's goroutine directly handles the segments.

Updates #231

PiperOrigin-RevId: 289728325

1 files changed, 5 insertions, 1 deletions

diff --git a/benchmarks/tcp/tcp_proxy.go b/benchmarks/tcp/tcp_proxy.go
index be0d7bdd6..dc96add66 100644
--- a/benchmarks/tcp/tcp_proxy.go
+++ b/benchmarks/tcp/tcp_proxy.go
@@ -85,7 +85,7 @@ func (netImpl) printStats() {
 
 const (
 	nicID      = 1       // Fixed.
-	rcvBufSize = 1 << 20 // 1MB.
+	rcvBufSize = 4 << 20 // 1MB.
 )
 
 type netstackImpl struct {
@@ -130,6 +130,10 @@ func setupNetwork(ifaceName string, numChannels int) (fds []int, err error) {
 				return nil, fmt.Errorf("setsockopt(..., SO_RCVBUF, %v,..) = %v", rcvBufSize, err)
 			}
 
+			if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, rcvBufSize); err != nil {
+				return nil, fmt.Errorf("setsockopt(..., SO_RCVBUF, %v,..) = %v", rcvBufSize, err)
+			}
+
 			if !*swgso && *gso != 0 {
 				if err := syscall.SetsockoptInt(fd, syscall.SOL_PACKET, unix.PACKET_VNET_HDR, 1); err != nil {
 					return nil, fmt.Errorf("unable to enable the PACKET_VNET_HDR option: %v", err)