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From Niklas Edmundsson <>
Subject httpd 2.4.25, mpm_event, ssl: Status of async write completion?
Date Thu, 02 Feb 2017 12:31:25 GMT

Hi all!

As we're seeing more and more https on I've noticed 
that the number of threads listed as state W in server-status has 

>From 2-4 threads busy using http we're talking 70-100 threads for the 
same bandwidth when the machine is pushing a mighty 2.7% average CPU 

This is on a large-file workload, serving plain files.

I anticipated a few more threads due to ssl, but for slow downloaders 
I would expect connections doing async write and mostly waiting for 
the bits to dribble through the Internet Tubes inbetween the 
occational wakeup to do ssl&send...

Are we not doing async write completion at all on https/ssl and 
falling back to the old worker behaviour of one thread per connection?

  Niklas Edmundsson, Admin @ {acc,hpc2n}      |
  At last I'm organized", he sighed, and died.

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