------- Comment From dougm...@us.ibm.com 2017-08-23 08:45 EDT-------
I tried running 4.13-rc6 with "cfq" set as default scheduler. The problem is 
even worse. I/O delays show up almost immediately. Many exceed the HTX 
10-minute limit. It seems that CFQ is even more broken on the latest kernels.

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https://bugs.launchpad.net/bugs/1709889

Title:
  Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to
  adapter for a very long time.

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