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net/tstun: remove buffer on outbound channel

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The buffer is not necessary, I was unable to observe any optimization,
and having an unbuffered channel offers potential scheduler
optimization.

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2022-08-25 10:34:25 -07:00
parent 58f35261d0
commit 0c34fc7b5b
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1 changed files with 3 additions and 4 deletions
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7
net/tstun/wrap.go
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@ -202,10 +202,9 @@ func wrap(logf logger.Logf, tdev tun.Device, isTAP bool) *Wrapper {
// a goroutine should not block when setting it, even with no listeners.
bufferConsumed: make(chan struct{}, 1),
closed: make(chan struct{}),
// outbound can be unbuffered; the buffer is an optimization.
outbound: make(chan tunReadResult, 1),
eventsUpDown: make(chan tun.Event),
eventsOther: make(chan tun.Event),
outbound: make(chan tunReadResult),
eventsUpDown: make(chan tun.Event),
eventsOther: make(chan tun.Event),
// TODO(dmytro): (highly rate-limited) hexdumps should happen on unknown packets.
filterFlags: filter.LogAccepts | filter.LogDrops,
}