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

[Poulpatine <poulpatine@xxxxxxxxx>]

Actually, my question was most about CPU performances than I/O perfs
but thank you for your response.

2008/10/15 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.
>



-- 
\o/ Poulpatine \o/

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users