[Bug 196816] poor disk IO performance on Digital Ocean cloud hosting

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196816

            Bug ID: 196816
           Summary: poor disk IO performance on Digital Ocean cloud
                    hosting
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: swills at FreeBSD.org

Created attachment 151754
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=151754&action=edit
First flame graph

Don't know what causes it yet, but disk IO is very slow in Digital Ocean cloud
hosting. Running bonnie++ on it takes so long I have yet to see it finish. I
tried setting sysctl kern.timecounter.hardware=TSC-low as well as
machdep.idle=hlt, but this didn't speed things up much. I got some CPU flame
graphs which I will attach. The first is with default settings, the second is
with the timecounter switched and the third is with that and machdep.idle
switched. Any advice?

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