Susan Hinrichs created TS-4330:
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Summary: Real or statistical differences in response time between
5.3 and 6.1
Key: TS-4330
URL: https://issues.apache.org/jira/browse/TS-4330
Project: Traffic Server
Issue Type: Bug
Components: Performance
Reporter: Susan Hinrichs
We are evaluating 6.1 in our production caching environment and verifying it
against a 5.3.x box in the same pod.
Our performance reporter (ysar) shows that the response time for 6.1 is higher
than it is on the 5.3 box. The difference is in the range of 10ms.
We also noticed that the error statistics difference. In 6.1 the reported
client aborts are higher. Also the number of connection failures is low and
the number of "other" errors is higher. In 5.3, the number of connection
failures is higher and the number of "other" errors is low.
Finally, I set the slow log on both machines. On the 6.1 machine, I see every
second or two an entry with ua_begin set to 0, all other fields set to -1
except for sm_finish which is 120 seconds. I do not see these slow logs on the
5.3 machine. It is as if the TCP deferred accept path is not being used on
the 6.1 build.
We are continuing to investigate, but wanted to share in case others have seem
similar issues.
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