relay: deepen datagram send queue and drop oldest-first#450
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Raise the mvfst datagram send queue above the default of 75 and switch the full-queue policy from rejecting the incoming datagram to popping the oldest, so a momentary write stall sheds stale frames rather than failing new writes. Relay listeners use writeBufSize=500; the upstream client leg uses 1000. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Raise the mvfst datagram send queue above the default of 75 and switch the full-queue policy from rejecting the incoming datagram to popping the oldest, so a momentary write stall sheds stale frames rather than failing new writes. Relay listeners use writeBufSize=500; the upstream client leg uses 1000.
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