Date: Sun, 22 Mar 2020 14:30:41 -0400 From: Ryan Stone <rysto32@gmail.com> To: freebsd-net <freebsd-net@freebsd.org> Subject: Can net.iflib.min_tx_latency=0 introduce an unbounded amount of latency? Message-ID: <CAFMmRNx4FkT2meX2o%2Be-ksgFMmAX6kveu%2BHBY8hxkv_StpyauQ@mail.gmail.com>
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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?help
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