cwinfo/yggdrasil-go
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cleanup/comments

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This commit is contained in:
Arceliar 2019-09-25 17:53:25 -05:00
parent b9e74f34ec
commit ac58c3586e
2 changed files with 9 additions and 11 deletions
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10
src/yggdrasil/link.go
View File

@ -291,9 +291,11 @@ func (intf *linkInterface) _cancelStallTimer() {
} }
} }
// called by an AfterFunc if we appear to have timed out // This gets called from a time.AfterFunc, and notifies the switch that we appear
// to have gotten blocked on a write, so the switch should start routing traffic
// through other links, if alternatives exist
func (intf *linkInterface) notifyBlockedSend() { func (intf *linkInterface) notifyBlockedSend() {
intf.Act(nil, func() { // Sent from a time.AfterFunc intf.Act(nil, func() {
if intf.sendTimer != nil { if intf.sendTimer != nil {
//As far as we know, we're still trying to send, and the timer fired. //As far as we know, we're still trying to send, and the timer fired.
intf.link.core.switchTable.blockPeer(intf.peer.port) intf.link.core.switchTable.blockPeer(intf.peer.port)
@ -387,8 +389,12 @@ func (w *linkWriter) sendFrom(from phony.Actor, bss [][]byte, isLinkTraffic bool
size += len(bs) size += len(bs)
} }
w.intf.notifySending(size, isLinkTraffic) w.intf.notifySending(size, isLinkTraffic)
// start a timer that will fire if we get stuck in writeMsgs for an oddly long time
var once sync.Once var once sync.Once
timer := time.AfterFunc(time.Millisecond, func() { timer := time.AfterFunc(time.Millisecond, func() {
// 1 ms is kind of arbitrary
// the rationale is that this should be very long compared to a syscall
// but it's still short compared to end-to-end latency or human perception
once.Do(func() { once.Do(func() {
w.intf.Act(nil, w.intf._notifySyscall) w.intf.Act(nil, w.intf._notifySyscall)
}) })

10
src/yggdrasil/switch.go
View File

@ -721,15 +721,6 @@ func (t *switchTable) _handleIn(packet []byte, idle map[switchPort]struct{}, sen
ports[best.elem.port].sendPacketsFrom(t, [][]byte{packet}) ports[best.elem.port].sendPacketsFrom(t, [][]byte{packet})
return true return true
} }
//delete(idle, best.elem.port)
// Tell ourselves to send to this node later
// If another (e.g. even better) hop becomes idle in the mean time, it'll take the packet instead
// FIXME this is just a hack, but seems to help with stability...
//go t.Act(nil, func() {
// t._idleIn(best.elem.port)
//})
//ports[best.elem.port].sendPacketsFrom(t, [][]byte{packet})
//return true
} }
// Didn't find anyone idle to send it to // Didn't find anyone idle to send it to
return false return false
@ -799,6 +790,7 @@ func (b *switch_buffers) _cleanup(t *switchTable) {
// Loops over packets and sends the newest one that's OK for this peer to send // 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 // 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) bool { func (t *switchTable) _handleIdle(port switchPort) bool {
// TODO? only send packets for which this is the best next hop that isn't currently blocked sending
to := t.core.peers.getPorts()[port] to := t.core.peers.getPorts()[port]
if to == nil { if to == nil {
return true return true