Re: [Xen-devel] Video Presentation on PCI Express x16 VGA Pass Through to Xen-based Windows XP Home Edition HVM Virtual Machine

["Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>]

On Thu, Oct 8, 2009 at 10:22 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>
> > > Did you change the build-id of Xen between the tests? Meaning did you
> > > check out a newer one between the releases?
> > >
> >
> > No. I did not change the changesets of xen between the tests.
>
> Good.
> >
> >
> > >
> > > What is your underlaying disk for your guest?
> > >
> >
> > I am not using a disk image file. I am using LVM2 logical volume for my Win
> > XP Home guest.
>
> Right. There were two other disks in the screenshots. Did either one of them
> contain the "virtualmachines" VG?

In the screenshots, the current drive (red color) is in the
virtualmachines volume group. All the other harddisks (other than
"current drive") are reference harddisks provided by the benchmark
software for comparison.

> >
> >
> > > Did you flush the cache before you ran the tests?
> > > echo 3 > /proc/sys/vm/drop_caches
> > >
> >
> > No I did not. I am not aware of this requirement.
>
> Please do.

I will do it before I start the Win XP guest. After I start win xp
domU, I won't be able to access dom0 any more. So I won't be able to
clear caches in between iterations of the disk I/O benchmark tests.

> >
> >
> > >
> > > Are you using stub-domain or normal QEMU?
> > >
> >
> > I don't think I am using stub-domain. I should be using normal QEMU.
>
> You are not based on your guest configuration.
>
> .. snip ..

I don't quite understand.

> > > How many iterations of the disk I/O benchmark did you run? As in, are 
> > > those
> > > screenshots of the first run, or the average over a couple of them.
> > >
> >
> > They are not averages. They are first runs.
>
> Do the numbers stay about the same on 2.6.31.1 if you run it a couple of 
> times? (And flush
> the cache between each run, that is it)

I will try to run the disk I/O benchmark tests a few iterations on
2.6.31.1. But I won't be able to clear caches in between iterations as
I can't access dom0 after I have started win XP domU.

--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
Blog URL: http://teo-en-ming-aka-zhang-enming.blogspot.com
Email: space.time.universe@xxxxxxxxx
MSN: teoenming@xxxxxxxxxxx
Mobile Phone: +65-9648-9798
Street: Bedok Reservoir Road
Republic of Singapore

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