Re: [Xen-users] DmU performances in HVM mode

[Luke S Crawford <lsc@xxxxxxxxx>]

Poulpatine <poulpatine@xxxxxxxxx> writes:
> I've recently installed Xen 3.2 on my system (Ubuntu 8.04 Hardy LTS)
> and for testing purpose I've created a Windows (Windows XP SP2)
> domain. In this domain, when I make benchmarks (like SuperPi or Sisoft
> Sandra Lite) the domain is used at 100%. But, when I launch a top on
> my dm0 the most busied processus is qemu-dm with 1,5% of CPU.
> Benchmarks results are very poors ...
...

> Is there a way to configure my domain in order to permit him to be
> more performant ?

HVM has slow I/O.  if you install the paravirtualized drivers for the guest OS
that should help a whole lot.  

The thing is, without paravirtualized drivers, you are essentially using qemu
to emulate a scsi or ide card for all your I/O, which is not particularly 
quick. 

you can play about with James Harper's (beta, I think) gplpv paravirt 
drivers for windows:

http://www.meadowcourt.org/downloads

those are the only paravirt windows drivers that I know of that are free.  
You can pay money to citrix or suse and get paravirt windows drivers.  


without paravirt drivers in the DomU, you are unlikely to achieve anything like
good I/O performance in HVM mode.  

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