xsteadfastx/wireguard-go
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device: reduce redundant per-packet overhead in RX path

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Peer.RoutineSequentialReceiver() deals with packet vectors and does not
need to perform timer and endpoint operations for every packet in a
given vector. Changing these per-packet operations to per-vector
improves throughput by as much as 10% in some environments.

Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jordan Whited 2023-11-07 15:24:21 -08:00 committed by Jason A. Donenfeld
parent 4ffa9c2032
commit 7c20311b3d
1 changed files with 15 additions and 6 deletions
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21
device/receive.go
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@ -445,7 +445,9 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
return
}
elemsContainer.Lock()
for _, elem := range elemsContainer.elems {
validTailPacket := -1
dataPacketReceived := false
for i, elem := range elemsContainer.elems {
if elem.packet == nil {
// decryption failed
continue
@ -455,21 +457,19 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
continue
}
peer.SetEndpointFromPacket(elem.endpoint)
validTailPacket = i
if peer.ReceivedWithKeypair(elem.keypair) {
peer.SetEndpointFromPacket(elem.endpoint)
peer.timersHandshakeComplete()
peer.SendStagedPackets()
}
peer.keepKeyFreshReceiving()
peer.timersAnyAuthenticatedPacketTraversal()
peer.timersAnyAuthenticatedPacketReceived()
peer.rxBytes.Add(uint64(len(elem.packet) + MinMessageSize))
if len(elem.packet) == 0 {
device.log.Verbosef("%v - Receiving keepalive packet", peer)
continue
}
peer.timersDataReceived()
dataPacketReceived = true
switch elem.packet[0] >> 4 {
case 4:
@ -512,6 +512,15 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
bufs = append(bufs, elem.buffer[:MessageTransportOffsetContent+len(elem.packet)])
}
if validTailPacket >= 0 {
peer.SetEndpointFromPacket(elemsContainer.elems[validTailPacket].endpoint)
peer.keepKeyFreshReceiving()
peer.timersAnyAuthenticatedPacketTraversal()
peer.timersAnyAuthenticatedPacketReceived()
}
if dataPacketReceived {
peer.timersDataReceived()
}
if len(bufs) > 0 {
_, err := device.tun.device.Write(bufs, MessageTransportOffsetContent)
if err != nil && !device.isClosed() {