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wgengine/magicsock: remove a per-DERP-packet map lookup in common case

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Updates #150

Change-Id: Iffb6eccbe7ca97af97d29be63b7e37d487b3ba28
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-01-13 14:01:49 -08:00 committed by Brad Fitzpatrick
parent 5a317d312d
commit 5404a0557b
1 changed files with 7 additions and 3 deletions
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4
wgengine/magicsock/magicsock.go
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@ -1508,6 +1508,7 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netaddr.IPPort, d
peerPresent := map[key.NodePublic]bool{}
bo := backoff.NewBackoff(fmt.Sprintf("derp-%d", regionID), c.logf, 5*time.Second)
var lastPacketTime time.Time
var lastPacketSrc key.NodePublic
for {
msg, connGen, err := dc.RecvDetail()
@ -1569,10 +1570,13 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netaddr.IPPort, d
}
// If this is a new sender we hadn't seen before, remember it and
// register a route for this peer.
if res.src != lastPacketSrc { // avoid map lookup w/ high throughput single peer
lastPacketSrc = res.src
if _, ok := peerPresent[res.src]; !ok {
peerPresent[res.src] = true
c.addDerpPeerRoute(res.src, regionID, dc)
}
}
case derp.PingMessage:
// Best effort reply to the ping.
pingData := [8]byte(m)