Re: [Xen-users] Question about ioemu ...

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> So ... it has no diference, right ? this is my question, I tested ,
> and it worked

It shouldn't make a difference to block devices.  For net devices it still has 
some kind of effect, but for block it's completely ignored.

> on both way. For me ..make a copy from dom0 to domU has no sense,
> it use
>
> network. It is not a copy from a partition to another, because I'm using
> NTFS 
>
> on a LVM virtual partition. Frorm my windows on DomU, I
> don't have acess
>
> to Dom0  (centOS) file system and vice-versa ..  

Well, I guess Jim meant to say that you should copy data from the VBD into the 
domU's memory?

Something like dd if=big_file of=/dev/null would achieve this, as a basic IO 
benchmark.

But in any case...  In an HVM domain you'll always be using the emulated 
devices, unless you install PV drivers.  In a PV domain you're always using 
the PV drivers anyhow.  The ioemu switch does not seem to have an effect for 
block devices anymore.

Cheers,
mark

> > PV drivers need to be enabled explicitly in the HVM guest, so you won't
> > be
> >
> >
> > able to measure a performance difference in IO unless you first install
> > and
> >
> >
> > configure these drivers.
> >
> >
> >
> > Cheers,
> >
> > Mark
> >
> >
> >
> > --
> >
> > Dave: Just a question. What use is a unicyle with no seat? And no pedals!
> >
> >
> > Mark: To answer a question with a question: What use is a skateboard?
> >
> > Dave: Skateboards have wheels.
> >
> > Mark: My wheel has a wheel!
>
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> http://lists.xensource.com/xen-users



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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