[Qemu-devel] [Bug 1812694] Re: qemu-system-x86_64 version 3.0+ is 20 times slower than version 2.12

[Alex Bennée]

Your linked drive doesn't seem to have any readme or documentation for
how this is invoked. Please see:

  https://www.qemu.org/contribute/report-a-bug/

Specifically the host/guest details and the full command line that you
have used to run this binary.

As developers may be wary about running on unknown binary on their
systems you may find it quicker to do some experiments yourself. If you
run qemu under perf for 2.12 and 3.0+ (or current git) that might give
some indication about what has changed.

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1812694

Title:
  qemu-system-x86_64 version 3.0+ is 20 times slower than version 2.12

Status in QEMU:
  Incomplete

Bug description:
  version 3.0+ is 20 times slower than version 2.12
  I wrote a small 64-bit operating system (SIGMAOS) in which I use the lzma 
decoder. unpacking the file takes 20 times slower than in version 2.12.
  You can download it from 
https://drive.google.com/drive/folders/0B_wEiYjzVkC0ZGtkbENENzF1Nms

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