glebius ac6cbfbc53 sfxge: limit software Tx queue size.
Previous implementation limits put queue size only (when Tx lock can't
be acquired), but get queue may grow unboundedly which results in mbuf
pools exhaustion and latency growth.

Submitted by:	Andrew Rybchenko <Andrew.Rybchenko at oktetlabs.ru>
Sponsored by:	Solarflare Communications, Inc.
2014-03-22 18:24:44 +00:00
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