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An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
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ethernet flow control
Posted Dec 16, 2011 16:57 UTC (Fri) by marcH (subscriber, #57642)
Ethernet flow control is effectively chaining queues across devices. Since the aggregated queue is bigger I can see how it *may in some cases* enhance TCP throughput. But it will obviously make any existing bufferbloat even worse.
Most importantly, Ethernet flow control will create HOL blocking.
Your mileage may vary.
Some old musings with Ethernet flow control: http://marc.herbert.free.fr/noq/
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