Github user shinrich commented on the issue:
https://github.com/apache/trafficserver/pull/1259
Some details in the jira description. We noticed this when we moved to a
newer compiler and started building against openssl 1.0.2. Somewhere in that
change, the communication patterns must have resulted in more, smaller reads
which created longer io block chains. We saw a very noticeable increase in CPU
utilization, and perf top pointed the finger at read_avail.
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