> Why do you need HVM guest? HVM, aka fully virtualized guests use Qemu
> to _emulate_ IDE (or SCSI) adapters and disks, so that'll be slow.
> If you can't switch to paravirtual (PV) guests, at least try to
> PV-on-HVM drivers, which should help a lot. Other possibility is to
> stubdoms with HVM, but that's not available in Xen shipped in CentOS
> Stubdoms can be found from Xen 3.4.x
> PV guests will be a lot faster, since there's no need for emulation.
> I recommend you to run PV guests.
We get the same performance under windows but comparing the difference between
the two it's easier to demonstrate with 2 x Linux systems. With regards to why
we use HVM, this is so we can do P2V migrations of various OS' into Xen.
Could you link me to the PV-on-HVM drivers for Linux, these sound like a good
way forward. Also Stubdoms are a new one on me, do you know of any recommended
reading. Googling draws up a blank apart from problems people have had.
Senior Engineer, Operations (Systems Group), UKSolutions
Telephone: 0845 004 1333, option 2
UKS Ltd, Birmingham Road, Studley, Warwickshire, B80 7BG Registered in England
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