Re: [Xen-users] Disk performance on HVM domains

[Marc Patino Gómez <mpatino@xxxxxxxxxxxx>]

Hi Pasi,

thanks for your answer. Any pointers to do this?

Regards,

Marc


Pasi Kärkkäinen wrote:
> On Mon, Oct 01, 2007 at 01:48:41PM +0200, Marc Patino Gómez wrote:
>   
> > Hi list,
> >
> > I converted one old FreeBSD 4.9 box to HVM domU (with AMD-V processors, 
> > with Intel-VT doesn't work). All works fine, but disk performance is too 
> > poor... about 8MB/s (in dom0 i get about 40MB/s). I did some test with 
> > VBD with file backed and LVM but performance stills poor.
> > Any advices?
> >
> > Is possible to use blktap in this case? Any pointers?
> >
> > If I use a SAN, network performance on HVM will be a problem?
> >
> > What's about tgt?
> >
> > I have one HVM old linux 2.4 domU and I can get far more disk troughtput 
> > than with FreeBSD, it is normal? In this case, domU is on Intel-VT Xen 
> > server, is Intel-VT io implementation better than AMD?
> > At now, I'm only testing, in the future I will need to virtualize some 
> > old FreeBSD servers with quite great IO demand
> >     
> You need to install PV (paravirtual) xen aware device drivers into FreeBSD.. 
>
> I don't know if there is such thing.. 
>
> -- Pasi
>
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