Don't suspend process when we push data to a full buffer.
Don't suspend process when we push data to a full buffer.

We're seeing instances in production where TCP incast can cause
processes to be descheduled, resulting in mailboxes backing up and
running out of memory.

http://www.snookles.com/slf-blog/2012/01/05/tcp-incast-what-is-it/

In cases where this happens it's better to just take a hit and drop
the data than to risk letting the mailbox back up.

voidlock/logplex,srid/logplex,mkrysiak/logplex