Public bug reported:
I consider this bug extremely insidious as it can ruin the performance
of linux while virtualbox is running. While setting up Oracle's
virtualbox-5.1 on my MacPro 3,1 under Ubuntu 16.10, I was puzzled by the
extremely bad system performance that I was seeing. Finally I realized
that the Processor tab in virtualbox was showing the total available
cores on my machine as 16 and the green bar showing the safe zone was
extended to 8 cores. Thus any user on an older machine like mine (which
has dual quad-core Harpertown processors) will be told to use twice the
recommended number of cores. Once I reduced the cores used from 8 to 4,
the system performance dramatically improved. This should be trivial to
fix as virtualbox should just check /proc/cpuinfo for the correct values
and stop assuming hyperthreading is universally available. I have filed
this upstream with Oracle as https://www.virtualbox.org/ticket/16265.
** Affects: virtualbox
Importance: Undecided
Status: New
** Package changed: libuser (Ubuntu) => virtualbox
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https://bugs.launchpad.net/bugs/1647260
Title:
virtualbox lies about available processors on non-hyperthreaded
processors
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