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[Plex86-devel] Re: [Plex86-developers] Performance characteristics
From: |
Sam Vilain |
Subject: |
[Plex86-devel] Re: [Plex86-developers] Performance characteristics |
Date: |
Thu, 20 Feb 2003 13:28:50 +1300 |
User-agent: |
KMail/1.5 |
My current hazy picture is; and no, I don't have any evidence ;-).
Full x86 VM solutions:
VMWare, old Plex86, VirtualPC - qualitatively agreed are all extremely slow
:-) This is because they are spending a lot of time performing
modifications of code segments to work around the x86 virtualisation
inadequacies.
Pure userland full VM solutions:
UML (standard) - 50% or less than host speed (I gather)
Hybrid solutions:
UML (``skas'' mode) - 70% of host speed (apparently)
Plex86+Bochs - something like 90% of host speed for simple ``tight loop''
tests
Plex86+Linux/HAL - potentially a little bit more than the above (?)
`chroot' based solutions:
FreeVSD/ProVSD - 99% of host speed (no host patch required, no true `root'
in virtualised servers)
Vserver - 99% of host speed (requires host patch, true `root' in
virtualised servers)
Of course, with the chroot based solutions, everything runs within the same
kernel. Calling it 99% of host speed is really a gross
oversimplification; issues such as the extra memory and filesystem areas
required by all the running servers will probably reduce that somewhat;
but this is the same for all the solutions.
Also, different solutions have different levels of stability and vendor
support. For instance, if you're an ISP wanting to sell ``Virtual
Dedicated Servers'' to clueless markets, ProVSD is the most turn-key
solution. Vserver based solutions are a bit more work, but IMHO worth it
in the long run.
Currently the plex86 based solutions are far from actually achieving the
above performance estimates for real world cases; but they should approach
those over time. So they can hardly be considered ready for production
use.
On Thu, 20 Feb 2003 10:05, Shai Fultheim wrote:
> All,
>
>
>
> Has anyone done any performance test or comparison between the different
> VM products around?
>
> What should be the expected performance loss in case of VMware or Plex
> or VirtualPC??
>
> What are the numbers for bochs??
>
>
>
> Any info will be appreciated.
>
>
>
> _________________________
> Shai Fultheim
--
Sam Vilain, address@hidden
Time is an illusion perpetrated by the manufacturers of space.
GRAFFITI
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