Re: [Xen-devel] no-carrier on qlogic 8242 10gig with linux 3.x running xen

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

On Wed, May 23, 2012 at 02:40:04AM -0700, Kristoffer Harthing Egefelt wrote:
> > Any luck?
> 
> >Actually after finding out about the pci=nomsi kernel parameter, I have not
> had any problems.
> >Regarding the firmware upgrade, qlogic and dell need a supported OS to run
> their diag tools on, I'm tired of >dealing with them, so I have not gathered
> this info yet.
> >Didn't try to downgrade the driver either.
> >But I'm about to try pci passthrough, to have 10gig directly in the domU.
> >I'll let you know if it works.
> 
> The pci=nomsi actually seems to create problems for us when using pci
> passthrough.
> We could not get more than 2.5 Gbit from a domU, using netback/netfront.

That is kind of expected - you are using the legacy IRQ and it can
only handle so much.

> It was suggested that we use pci passthrough to get the full 10Gbit.
> However dom0 and domU crashes periodically with: 
> 
> kernel irq 60: nobody cared (try booting with the "irqpoll" option) 
> kernel Pid: 0, comm: swapper Not tainted

Hmm. Is that from dom0 or from domU?
> 
> Booting with irqpoll has no effect.

On whatever host that showed that?
> 
> So I tried to upgrade the firmware on the qlogic cards to 1.09.22 - no
> change.
> Qlogic's latest firmware is 1.09.65 - but is not installable on the DELL oem
> cards.
> I was not able to downgrade the qlogic driver in linux 3.2 to 5.0.24 from
> 5.0.25 as suggested in this thread, the driver will not compile - struct
> dev_mc_list is no longer defined in netdevice.h.
> 
> As far as I can tell the pci=nomsi disables the irq handling needed for pci
> passthrough.
> Could someone confirm this?
> Could someone also clarify if this is a qlogic driver issue or a xen issue.

No idea. Without access to the hardware it is really hard to come
up with any reasonable idea on this.

> 
> Thanks
> Kristoffer
> 
> 
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