Re: [Xen-users] Xen 4.2 + XP x64 + PVGPL 2K3 x64 = BSOD (UNMOUNTABLE_BOOT_VOLUME)

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Sun, 19 May 2013 10:42:06 -0700, Andrew Bobulsky <rulerof@xxxxxxxxx> 
wrote:
> On May 19, 2013, at 10:18 AM, Gordan Bobic <gordan@xxxxxxxxxx> wrote:
>
> > On 05/19/2013 06:14 PM, Andrew Bobulsky wrote:
> > > On May 19, 2013, at 5:10 AM, Gordan Bobic <gordan@xxxxxxxxxx> 
> > > wrote:
> > > > The subject says it all, really.
> > > >
> > > > I couldn't find any XP x64 specific drivers, but in all other 
> > > > cases
> > > > 2K3 x64 drivers have worked for me on XP x64, so since the kernels
> > > > and driver models are the same, I am guessing this should work.
> > > >
> > > > Thankfully I took a snapshot of the block device before installing 
> > > > the drivers.
> > > > Is there a better driver to use on XP x64?
> > > >
> > > > The HVM disk performance is really quite attrocious. From dom0,
> > > > I get about 60MB/s on unbuffered reads with dd iflag=direct and
> > > > hdparm -t. From domU I get 5MB/s and qemu-dm hits 100% CPU usage.
> > > >
> > > > Is there a way to make this work
> > > Always!  I'm just not sure how :P
> > >
> > > > establish why it doesn't work?
> > > If you could get the system booted from a completely different 
> > > storage
> > > device, and then try to get GPLPV working on a volume that's not 
> > > the
> > > boot volume, that might be a good place to start.  Personally, due 
> > > to
> > > either my brand of weirdness or perhaps tunnel vision, I would boot
> > > from an iSCSI volume and then attempt to interact with the "local"
> > > disks that way.
> > Funny you should mention iSCSI. My setup is an iSCSI volume exposed
> > to the domU "raw" as a physical IDE disk. But domU seems to be
> > alergic to it. If I leave the disk spec in the domU config as hda,
> > it BSODs with the mentioned error. If I change it in the config to
> > xvda, the domU starts to burn through 100% of CPU on all cores given
> > to it and never finishes booting.
> Ooooo..... Well, you can try it if you like.  Download the Microsoft
> iSCSI boot-capable initiator, install it, then download and install
> sanbootconf from the iPXE web site.
>
> Once you're done, reboot the domain and boot from the built-in iPXE.
> Use Ctrl-B to enter the command line and run the following:
>
> dhcp net0
> sanboot iscsi:your.iscsi.server::::name.of.target
>
> That's assuming you're not using chap auth or something, and that 
> your
> LUN is also LUN 0 on the target.  I can dig up the doc if you need
> help on that, though :)
I have considered PXE booting the domU, but my concern is that I can
only do that via the emulated NIC. If qemu-dm tops out at 5MB/s on
emulated devices, this is presumably going to be just as bad.

Is there a way to PXE boot the domU via the physical PCI passthrough
NIC?

Gordan

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