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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Sep 11, 2009 at 11:37:15PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
> Hi,
> 
> Please refer to the disk I/O benchmark results here:
> 
> http://teo-en-ming-aka-zhang-enming.blogspot.com/2009/09/disk-io-benchmark-results-with-xen.html
> 
> Results show that Win XP HVM guest runs faster in 2.6.30-rc3 than
> 2.6.31-rc6.
> 

Btw you might also want to test with the latest rebase/master tree; it's
at Linux 2.6.31 final now.

-- Pasi

> -- 
> 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
> 
> On Fri, Sep 11, 2009 at 8:19 AM, Mr. Teo En Ming (Zhang Enming) <
> space.time.universe@xxxxxxxxx> wrote:
> 
> > Hi,
> >
> > I will try to stop unnecessary services on Dom 0 and do a disk I/O
> > benchmark between WinXP domU on 2.6.30-rc3 and 2.6.31-rc6 tonight (Singapore
> > time). That will be more conclusive.
> >
> > --
> > 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
> >
> > On Fri, Sep 11, 2009 at 2:17 AM, Jeremy Fitzhardinge <jeremy@xxxxxxxx>wrote:
> >
> >> On 09/10/09 07:03, Pasi Kärkkäinen wrote:
> >> > On Thu, Sep 10, 2009 at 08:28:03PM +0800, Mr. Teo En Ming (Zhang Enming)
> >> wrote:
> >> >
> >> >> Dear All,
> >> >>
> >> >> Here is my latest video presentation on VGA passthrough. Please check
> >> out my
> >> >> blog at http://teo-en-ming-aka-zhang-enming.blogspot.com/ or the
> >> Youtube
> >> >> link at http://www.youtube.com/watch?v=1ia3IwG6tp4
> >> >>
> >> >> The "not enough free resources" problem for nVidia Geforce 8400 GS PCI
> >> >> Express x16 graphics card in earlier presentation videos:
> >> >>
> >> >> http://www.youtube.com/watch?v=HNEiSI...<
> >> http://www.youtube.com/watch?v=HNEiSInrav0>
> >> >>
> >> >> http://www.youtube.com/watch?v=_hOT_9...<
> >> http://www.youtube.com/watch?v=_hOT_9LIG5w>
> >> >>
> >> >> was fixed. Device manager in Windows XP HVM domU no longer shows an
> >> >> exclamation mark besides the nVidia Geforce 8400 GS graphics card. The
> >> >> device is working properly and the resources tab shows the available
> >> memory
> >> >> ranges.
> >> >>
> >> >> Full VGA passthrough to Windows XP HVM guest operating system using Xen
> >> >> virtualization has been realized. I am now able to run 3-D video
> >> benchmarks
> >> >> on the passed through nVidia GeForce 8400 GS graphics card.
> >> >>
> >> >> All this is possible using Xen 3.5 hypervisor with Intel supplied VGA
> >> >> passthrough patches. Instead of using pvops dom0 kernel 2.6.31-rc6
> >> which
> >> >> causes Win XP domU to run slowly, I am now using pvops dom0 kernel
> >> >> 2.6.30-rc3.
> >> >>
> >> >>
> >> > Jeremy: Are you aware of any changes after 2.6.30-rc3 that could cause
> >> > this HVM slowness?
> >> >
> >>
> >> I can't think of anything, unless the new swiotlb code is causing
> >> problems.
> >>
> >> > Any tips how it could be debugged?
> >> >
> >>
> >> It would help to isolate where the slowness is coming from.  How much
> >> slowdown are we talking about?  Is the HVM domain doing lots of IO at
> >> the time?  Are there any processes using lots of time in dom0?  What's
> >> the interrupt rate like?
> >>
> >>    J
> >>
> >
> >
> >
> >
> >

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