Hello list,
right now I run a bunch of PVM Xen guests, everything is fine. But on the
horizon, there a potential need shows up, that I may have to run one or more
HVM guests.
Some time ago, I did some tests, and I observed the following on a host:
I activated the AMD VT extension in the BIOS, because I wanted to test to
setup a HVM machine. While this was activated, the PVM domU running on the
same host, had a unusual slow NFS performance. After I was ready with the
tests, I disabled the AMD VT in the BIOS again, and the NFS speed
was "normal" again. The NFS speed with VT enabled was about 1/3rd slower
than without. The dom0 and domU are 64Bit, SLES10SP1 systems.
Is this normal what I've seen? If yes, I guess it's not recommended to run
PVM and HVM systems on the same dom0? Or if no, any idea, what I can do
about it?
Further I'd like to know, whether a xm mem-set will work for HVM domU's?
I guess, in case the OS supports it, then it will work?
I've also read about paravirtual drivers for HVM guests, and I've seen a
xen-balloon.ko for HVM Linux guests, but I want to run MS Windows, are there
also such drivers available?
VMWare had, or still has, don't use it anymore since there is xen ;), a
limit on the maximum size of a block device, at 2TB. So if I wanted to share
a disk larger than 2TB, then the VMWare guest was/is only able to see the
2TB but not more. Does in Xen exists a similar limit on block device size?
kind regards
Sebastian
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