I've been tracking down a bug at work that appears to be due to
excessive latency introduced on the TX side of a TCP connection. In
looking through the iflib code, I noticed the tunable
net.iflib.min_tx_latency. My reading of the iflib code is that if a
packet is enqueued to a tx ring but not posted (when
min_tx_latency=0), then iflib can introduce an unbounded amount of
latency if the ring is idle. Is my reading of the code correct?
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