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mirror of https://github.com/cwinfo/yggdrasil-go.git synced 2024-12-23 12:15:39 +00:00

drop packets that have been queued for longer than some timeout (currently 25ms) instead of using fixed length queues

This commit is contained in:
Arceliar 2018-06-25 18:12:18 -05:00
parent 7695a3fcbf
commit b63b534fa7

View File

@ -586,36 +586,66 @@ func (t *switchTable) handleIn(packet []byte, idle map[switchPort]struct{}) bool
}
}
// Info about a buffered packet
type switch_packetInfo struct {
bytes []byte
time time.Time // Timestamp of when the packet arrived
}
// Used to keep track of buffered packets
type switch_buffer struct {
packets []switch_packetInfo // Currently buffered packets, which may be dropped if it grows too large
count uint64 // Total queue size, including dropped packets
}
func (b *switch_buffer) dropTimedOut() {
// TODO figure out what timeout makes sense
const timeout = 25 * time.Millisecond
now := time.Now()
for len(b.packets) > 0 && now.Sub(b.packets[0].time) > timeout {
util_putBytes(b.packets[0].bytes)
b.packets = b.packets[1:]
}
}
// Handles incoming idle notifications
// Loops over packets and sends the newest one that's OK for this peer to send
// Returns true if the peer is no longer idle, false if it should be added to the idle list
func (t *switchTable) handleIdle(port switchPort, buffs map[string][][]byte) bool {
func (t *switchTable) handleIdle(port switchPort, buffs map[string]switch_buffer) bool {
to := t.core.peers.getPorts()[port]
if to == nil {
return true
}
var best string
var bestSize int
for streamID, packets := range buffs {
var bestSize uint64
for streamID, buf := range buffs {
// Filter over the streams that this node is closer to
// Keep the one with the smallest queue
packet := packets[0]
coords := switch_getPacketCoords(packet)
if (bestSize == 0 || len(packets) < bestSize) && t.portIsCloser(coords, port) {
buf.dropTimedOut()
if len(buf.packets) == 0 {
delete(buffs, streamID)
continue
}
buffs[streamID] = buf
packet := buf.packets[0]
coords := switch_getPacketCoords(packet.bytes)
if (bestSize == 0 || buf.count < bestSize) && t.portIsCloser(coords, port) {
best = streamID
bestSize = len(packets)
bestSize = buf.count
}
}
if bestSize != 0 {
packets := buffs[best]
var packet []byte
packet, packets = packets[0], packets[1:]
if len(packets) == 0 {
buf := buffs[best]
var packet switch_packetInfo
// TODO decide if this should be LIFO or FIFO
packet, buf.packets = buf.packets[0], buf.packets[1:]
buf.count--
if len(buf.packets) == 0 {
delete(buffs, best)
} else {
buffs[best] = packets
buffs[best] = buf
}
to.sendPacket(packet)
to.sendPacket(packet.bytes)
return true
} else {
return false
@ -624,8 +654,8 @@ func (t *switchTable) handleIdle(port switchPort, buffs map[string][][]byte) boo
// The switch worker does routing lookups and sends packets to where they need to be
func (t *switchTable) doWorker() {
buffs := make(map[string][][]byte) // Packets per PacketStreamID (string)
idle := make(map[switchPort]struct{}) // this is to deduplicate things
buffs := make(map[string]switch_buffer) // Packets per PacketStreamID (string)
idle := make(map[switchPort]struct{}) // this is to deduplicate things
for {
select {
case packet := <-t.packetIn:
@ -633,12 +663,12 @@ func (t *switchTable) doWorker() {
if !t.handleIn(packet, idle) {
// There's nobody free to take it right now, so queue it for later
streamID := switch_getPacketStreamID(packet)
packets := append(buffs[streamID], packet)
for len(packets) > 32 {
util_putBytes(packets[0])
packets = packets[1:]
}
buffs[streamID] = packets
buf := buffs[streamID]
buf.dropTimedOut()
pinfo := switch_packetInfo{packet, time.Now()}
buf.packets = append(buf.packets, pinfo)
buf.count++
buffs[streamID] = buf
}
case port := <-t.idleIn:
// Try to find something to send to this peer