Re: [Xen-devel] GPLPV and pci passthrough

[<djmagee@xxxxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of djmagee@xxxxxxxxxxxx
> Sent: Friday, January 27, 2012 2:03 PM
> To: James Harper; lta@xxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] GPLPV and pci passthrough
> 
> I checked, and no devices are sharing IRQs.  I'll try the
> windows2003/ndis5 drivers and see if that makes a difference.  Of
> course, the base image for my win7 vms seems to have gotten corrupted,
> so I'll have to build a new one.

Oops, sorry about the top post...

I tried the Win2003 build and it works like a charm, and has native
performance across my gbit network in at least one direction.

> 
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> > bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> > Sent: Wednesday, January 25, 2012 7:23 PM
> > To: djmagee@xxxxxxxxxxxx; lta@xxxxxx
> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] GPLPV and pci passthrough
> >
> > >
> > > James,
> > >   At least one other person (Lta, included in this message) and I
> > have
> > > had problems using passthrough pci devices and your GPLPV drivers
> at
> > the
> > > same time.  My symptoms are that SMB connections are totally
> > unreliable
> > > (however, downloading over http seems to work well enough).
> > > For example, if I start a video or audio file, playing from the
> > network, it will
> > > play the first few seconds fine, then the connection drops out.
> > > I can confirm that the problems don't exist when not passing
> through
> > any
> > > devices.
> > >
> > >   I'm using xen-unstable c/s 24465, 3.2.1 dom0, win 7 64bit domU
> > with
> > > an ATI 4770, USB controller, and ICE1712 based pci sound card
> passed
> > > through.  I used the gplpv_Vista2008x64_0.11.0.308.msi drivers.
> > >
> > >   I tried the -debug drivers, and I see a ton of output in qemu
> > log,
> > > however, all that output seems to be at initialization.  I do not
> see
> > any
> > > additional output from your drivers after boot, including when I'm
> > > experiencing problems.
> > >
> > >   I took a quick look at tcpdump output and it does seem the guest
> > is
> > > ACKing the packets as they come in, so my first guess is that
> they're
> > getting
> > > lost somewhere between the driver and the OS network stack.
> > >
> > >   I've never set up a build environment for these drivers so I
> > haven't
> > > tried adding any extra debug output.  Have you looked into the (or
> a
> > similar)
> > > problem before, or have a more verbose debug copy of the net
driver
> > you've
> > > used to diagnose similar problems before?
> > >
> > >   I guess the real question is, do you have any idea where we
> > should
> > > start looking?
> > >
> >
> > I'd be first looking at interrupt sharing. Maybe GPLPV doesn't like
> > sharing interrupts with anything?
> >
> > Have a look in device manager and set the view as "Resources by
type"
> > and see if anything is sharing an interrupt with the "Xen PCI Device
> > Driver".
> >
> > James
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 
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