ccub
Contributor
Contributor

Dell PE 840, paravirtualization and 64 bit

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Hello,

I have recently installed a VMWare ESXi 3.5 in my Dell PE 840

It

work fine without paravirtualization, but if I enable

paravirtualization for improve performance and use the Intel-V

capabilities, I can't install or run a 64 bit OS...

It work in 32 bit, i386 OS..

What's the problem ?

Regards.

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nick_couchman
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First of all, word is that the VMI (Paravirtualization) support is not applicable to 64-bit operating systems - it's only for 32-bit O/Ss. I think this is because 64-bit O/Ss use the VT capabilities on the chip and aren't affected by PV support. You'll still want to install the VMware drivers in the guest, as these improve network and disk performance, but CPU performance should be handled by VT support and should not require VMI.

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nick_couchman
Immortal
Immortal

First of all, word is that the VMI (Paravirtualization) support is not applicable to 64-bit operating systems - it's only for 32-bit O/Ss. I think this is because 64-bit O/Ss use the VT capabilities on the chip and aren't affected by PV support. You'll still want to install the VMware drivers in the guest, as these improve network and disk performance, but CPU performance should be handled by VT support and should not require VMI.

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ccub
Contributor
Contributor

Thank you for precisions !

So it's normal that the "long mode" is not present in cpu's flags when I

use VMI !?

but CPU performance should be handled by VT support and should not require VMI.

So, in a 32 bit guest O/Ss with VMware drivers, I don't improve

performance (or just a little bit) if I enable VMI ?

nick.couchman a écrit :

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