Re: [Xen-users] Really slow disk write on Ubuntu

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 24, 2010 at 07:26:30PM +0200, rudi wrote:
> David Markey wrote:
>> Why not use paravirtualise?
>
> AFAIK paravirtualising Ubuntu is troublesome and requires a little work  
> a the moment (a kernel patch and so on)
>

No it doesn't require patches. 

Ubuntu 10.04 ships with Xen PV domU capable kernel,
just like earlier versions of Ubuntu.

I installed Ubuntu 10.04 as a Xen PV guest last week, using the standard kernel
provided by the distro.. you can also boot the ubuntu installer as a Xen PV 
guest 
so it's pretty easy to do the install aswell.

-- Pasi


, so we did a quick test  
> para-virtualising the standard "Oracle Enterprise Linux 5 64-bit"  
> provided by Oracle, on top of Oracle-vm and running the same benchmarks.
>
> Results were sligthly better but still far from our expectations. Disk  
> writes around 10-15 MB/s.
>
> My doubt is: should we expect much better results (and by consequence,  
> there is a big misconfiguration/mistake somewhere in our stack) or these  
> results are typical and unexceptional for this kind of systems?
>
>
>
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