https://issues.apache.org/bugzilla/show_bug.cgi?id=56348

            Bug ID: 56348
           Summary: ReadListener reading stream on different thread very
                    slow
           Product: Tomcat 8
           Version: 8.0.5
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: yann.simon...@gmail.com

In a ReadListener, if the servlet input stream is read with another thread as
the servlet thread, the upload is very slow.

The following sample application reproduces the problem:
https://github.com/yanns/servlet31_async/tree/async-perf

/upload2 reads the input stream in the servlet thread
/upload forks a new thread that reads the servlet input stream

My measurements:

With tomcat 8.0.5
/upload: 2 minutes
/upload2: 3,8 s

It is expected that /upload is more slow that /upload2, but not with that
difference.

The same tests with jetty:
/upload: 9,5 s
/upload2: 3,7s

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