[Qemu-devel] [Bug 1129957] Re: Performance issue running quest image on qemu compiled for Win32 platform

[Jacob Kroon]

For linux, the build is done by the native Fedora 18 gcc, 4.7.2
For Win32, the build is done by Fedora 18's mingw compiler, 4.7.2

Configuration for Win32 (from config.log):
# Configured with: './configure' '--disable-guest-agent' '--disable-vnc' 
'--disable-werror' '--extra-cflags=-pg' '--extra-ldflags=-pg' 
'--target-list=i386-softmmu' '--cross-prefix=i686-w64-mingw32-'

NOTE: debug is not enabled, since it breaks current QEMU build
(undefined references to 'ffs')

Configuration for Linux (from config.log):
# Configured with: './configure' '--disable-guest-agent' '--disable-vnc' 
'--disable-werror' '--extra-cflags=-pg' '--extra-ldflags=-pg' 
'--target-list=i386-softmmu' '--enable-debug' '--enable-kvm'

NOTE: although I pass --enable-kvm to configure, I haven't passed it to
qemu when running the executables

Commandline for running on Win32 (started from a Cygwin terminal) and also with 
Fedora+Wine:
./qemu/i386-softmmu/qemu-system-i386w.exe -L qemu/pc-bios/ vxworks.img

Commandline for running on Fedora:
./qemu/i386-softmmu/qemu-system-i386 -L qemu/pc-bios/ vxworks.img

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https://bugs.launchpad.net/bugs/1129957

Title:
  Performance issue running quest image on qemu compiled for Win32
  platform

Status in QEMU:
  New

Bug description:
  I'm seeing performance issues when booting a guest image on qemu 1.4.0 
compiled for the Win32 platform.
  The same image boots a lot faster on the same computer running qemu/linux on 
Fedora via VmWare, and even running the Win32 exectuable via Wine performs 
better than running qemu natively on Win32.

  Although I'm not the author of the image, it is located here:
  http://people.freebsd.org/~wpaul/qemu/vxworks.img

  All testing has been done on QEMU 1.4.0.

  I'm also attaching a couple of gprof logs. For these I have disabled
  ssp in qemu by removing "-fstack-protector-all" and
  "-D_FORTIFY_SOURCE=2" from the qemu configure script.

  qemu-perf-linux.txt
  ================
  Machine - Windows XP - VmWare - Fedora - QEMU

  qemu-perf-win32.txt
  =================
  Machine - Windows XP - QEMU

  qemu-perf-wine.txt
  ================
  Machine - Windows XP - VmWare - Fedora - Wine - QEMU

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