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https://issues.apache.org/jira/browse/TS-4330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15425135#comment-15425135
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Susan Hinrichs commented on TS-4330:
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I haven't been looking at 6.2 in production recently. @bcall has been looking
more recently and has not seen any significant performance differences. So I
assume the issue has been resolved or I was confused when looking earlier.
> 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
> Fix For: 7.0.0
>
>
> 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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