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Interval: 1.00s
  Avg transfer speed: 117.55 MB/s
...
  Productive sysread ratio: 13.70%
  Avg productive sysread time: 21.68 us
  Avg unproductive sysread time: 13.37 us

SSL_read(s, buf, 16384) => 16384  (9 us)
SSL_read(s, buf, 16384) => -1  (7 us)
SSL_read(s, buf, 16384) => -1  (1 us)
...
SSL_read(s, buf, 16384) => -1  (2 us)
SSL_read(s, buf, 16384) => -1  (1 us)
SSL_read(s, buf, 16384) => -1  (1 us)

SSL_read(s, buf, 16384) => 16384  (12 us)
SSL_read(s, buf, 16384) => -1  (5 us)
...
SSL_read(s, buf, 16384) => 16384  (18 us)
SSL_read(s, buf, 16384) => -1  (75 us)
SSL_read(s, buf, 16384) => 16384  (24 us)

$ grep -c "=> 16384" debug_ssl2.txt
613635
$ grep -c "=> \-1" debug_ssl2.txt
3779378