Bug 845751 - qemu virtualization extremely slow
qemu virtualization extremely slow
Product: Fedora
Classification: Fedora
Component: qemu (Show other bugs)
i686 Linux
unspecified Severity high
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Assigned To: Fedora Virtualization Maintainers
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-08-04 10:59 EDT by Rui Mota
Modified: 2013-01-09 07:06 EST (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-08-04 11:07:23 EDT
Type: Bug
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Description Rui Mota 2012-08-04 10:59:29 EDT
qemu is extremely slow when running a CPU that does not support virtualization.
The virtual machine performance makes it impossible to work with.
But when using another product like vmware the virtual machine performs very good.
My laptop is not that old but unfortunately it does not support virtualization.
The command:
egrep '^flags.*(vmx|svm)' /proc/cpuinfo

brings nothing.
It would be very useful for my daily work if qemu works as well as vmware.

How reproducible:
Never worked fine as long as I remember.
I keep switching to vmware every release of qemu I try hoping that some day some one will look at vmware code and implement the same algorithm.

Steps to Reproduce:
1. create a vm in a CPU that doest not support virtualization.

Actual results:
Super slow virtual machine and impossible to work with.

Expected results:
Should work as well as vmware as the system configuration is the same.
Comment 1 Richard W.M. Jones 2012-08-04 11:07:23 EDT
There's no possible way we can solve this in Fedora.

I won't even suggest that you take it up with upstream
qemu unless you have a huge set of patches and/or a
radical new approach.

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