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https://issues.apache.org/jira/browse/TS-3044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154210#comment-14154210
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John Plevyak commented on TS-3044:
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The perror is from the original AIO_MODE_NATIVE code. I was just following
the style as this was a minimal patch just to add the eventfd handling. I
agree that we should change that to standard ATS errors. For most unix/linux
installations waiting for less than 10msec is the same as waiting for 0msecs,
and can result in busy spinning. The iocore has a minimum wait time, so
HRTIME_MSECONDS(4) is disingenuous as well as being a poor idea (if it actually
was obeyed).
> linux native AIO should use eventfd if available to signal thread
> -----------------------------------------------------------------
>
> Key: TS-3044
> URL: https://issues.apache.org/jira/browse/TS-3044
> Project: Traffic Server
> Issue Type: Improvement
> Components: Cache
> Reporter: John Plevyak
> Assignee: Phil Sorber
> Fix For: 5.2.0
>
> Attachments: native-aio-eventfd.patch
>
>
> linux native AIO has the ability to signal the event thread to get off the
> poll and service the disk via the io_set_eventfd() call. linux native AIO
> scales better than the thread-based IO, but the current implementation can
> introduce delays on lightly loaded systems because of the thread is waiting
> on epoll(). This can be remedied by using io_set_eventfd
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