Re: [Xen-devel] [Xen-users] substantial shutdown delay for PV guests with PCI -passthrough

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Apr 18, 2014 at 11:47:46PM +0200, Atom2 wrote:
> This is just a (very) gentle ping ... or have I missed out on a reply?

I ran an PV guest with PCI passthrough this week and it had no trouble -
didn't see 10 seconds or so. But I did the shutdown from within the
guest (poweroff). 

What is the kernel you are running as your dom0? Is it the same as
frontend?

> 
> Thanks Atom2
> 
> Am 02.04.14 17:17, schrieb Atom2:
> >
> >Am 02.04.14 16:44, schrieb Ian Jackson:
> >>Atom2 writes ("Re: [Xen-devel] [Xen-users] substantial shutdown delay
> >>for PV guests with PCI -passthrough"):
> >>>Am 21.03.14 19:11, schrieb Ian Jackson:
> >>>>Can you run it again with this, on top of the previous patch, please ?
> >>>
> >>>Sure, the new output of xl -vvv create -F domain is again attached to
> >>>this e-Mail.
> >>
> >>Sorry for the delay replying.  I have been ill :-(.
> >Sorry to hear that. Though I noticed your absence from the list I simply
> >assumed that you were off on vacation. In any case good to see you back.
> >>
> >>><NOTE: at this point a 10s pause happens>
> >>>libxl: error: libxl_device.c:1134:libxl__wait_for_backend_deprecated:
> >>>Backend /local/domain/0/backend/pci/4/0 not ready (state 7)
> >>>libxl: error: libxl_device.c:1138:libxl__wait_for_backend_deprecated:
> >>>FE /local/domain/4/device/pci/0 state 6
> >>>libxl: debug: libxl_pci.c:204:libxl__device_pci_remove_xenstore: pci
> >>>backend at /local/domain/0/backend/pci/4/0 is not ready
> >>>libxl: error: libxl_pci.c:1250:do_pci_remove:
> >>>xc_domain_irq_permission irq=16
> >>
> >>So the backend here is in state 7 (Reconfiguring), but the frontend is
> >>in state 6 (Closed).  I think this is a bug in pciback.
> >>
> >>I looked at drivers/xen/xen-pciback/xenbus.c in Linux 3.13 and found
> >>xen_pcibk_frontend_changed which seems to do roughly what I would
> >>expect.
> >>
> >>Has this changed at some point ?
> >>
> >>Atom, what kernel are you using ?
> >All the error messages stem from kernel 3.11.7. In the meantime 3.13.2
> >became stable for gentoo and I installed that a few days ago. I have not
> >run the debug output yet or timed the shutdown process, but there's
> >still a delay with that kernel and it feels as long as before. I you
> >want, I can clearly provide new debug output or timing information.
> >
> >Thanks Atom2
> >>
> >>Thanks,
> >>Ian.
> >>
> >>_______________________________________________
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> >>http://lists.xen.org/xen-devel
> >>
> >
> >_______________________________________________
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> >http://lists.xen.org/xen-devel
> 
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