[bug:1787325] TLS/SSL access of GlusterFS mounts is slower than with no TLS/SSL enabled.

[amarts]

bugzilla-URL: https://bugzilla.redhat.com/1787325
When we enable TLS/SSL on our data path we see a 50% performance hit in throughput.

Version-Release number of selected component (if applicable):

All glusterFS versions

How reproducible:

Every time.

Steps to Reproduce:

1. Run read / write perf test(say DD), note results
2. Enable TLS/SSL on the volume
3. Re run perf tests, compare throughput.

Actual results:

50% perf hit

Expected results:

Minimal performance hit.

[amarts]

[{'bug_id': 1787325,
'count': 1,
'creation_time': <DateTime '20200102T12:04:36' at 0x7f6ff6d31748>,
'creator': 'moagrawa',
'creator_id': 351498,
'id': 13488137,
'is_private': False,
'tags': [],
'text': 'When we enable TLS/SSL on our data path we see a 50% performance '
'hit in throughput.\n'
'\n'
'Version-Release number of selected component (if applicable):\n'
'\n'
'All glusterFS versions\n'
'\n'
'How reproducible:\n'
'\n'
'Every time.\n'
'\n'
'Steps to Reproduce:\n'
'1. Run read / write perf test(say DD), note results\n'
'2. Enable TLS/SSL on the volume\n'
'3. Re run perf tests, compare throughput.\n'
'\n'
'Actual results:\n'
'\n'
'50% perf hit\n'
'\n'
'Expected results:\n'
'\n'
'Minimal performance hit.',
'time': <DateTime '20200102T12:04:36' at 0x7f6ff6d31668>},
{'bug_id': 1787325,
'count': 2,
'creation_time': <DateTime '20200102T12:05:56' at 0x7f6ff6d31940>,
'creator': 'moagrawa',
'creator_id': 351498,
'id': 13488144,
'is_private': False,
'tags': [],
'text': 'After configuring AES128 cipher we have found performance is '
'improved around 20% so we are using AES128 as a default cipher '
'option.',
'time': <DateTime '20200102T12:05:56' at 0x7f6ff6d31860>},
{'bug_id': 1787325,
'count': 3,
'creation_time': <DateTime '20200102T12:09:12' at 0x7f6ff6d31b38>,
'creator': 'bugzilla-bot',
'creator_id': 399691,
'id': 13488153,
'is_private': False,
'tags': [],
'text': 'REVIEW: https://review.gluster.org/23952 (socket: Use AES128 cipher '
'in SSL if AES is supported by CPU) posted (#2) for review on master '
'by MOHIT AGRAWAL',
'time': <DateTime '20200102T12:09:12' at 0x7f6ff6d31a58>}]