Re: [PATCH] PCI/VMD: White list for fast interrupt handlers

["Derrick, Jonathan" <jonathan.derrick@intel.com>]

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On Wed, 2018-05-09 at 09:26 -0600, Keith Busch wrote:
> On Tue, May 08, 2018 at 09:38:28PM -0700, Christoph Hellwig wrote:
> > On Tue, May 08, 2018 at 10:00:22AM -0600, Keith Busch wrote:
> > > Devices with slow interrupt handlers are significantly harming
> > > performance
> > > when their interrupt vector is shared with a fast device. This
> > > patch
> > > creates a class code white list for devices with known fast
> > > interrupt
> > > handlers, and all other devices will share a single vector so
> > > they don't
> > > interfere with performance.
> > > 
> > > At the moment, only the NVM Express class code is on the list,
> > > but more
> > > may be added if VMD users desire to use other low-latency devices
> > > in
> > > these domains.
> > 
> > I think this is far too much of a hack.   Just don't use VMD if
> > your
> > care about performance.
> 
> I'm not aware of an easier way you can direct-assign an entire PCIe
> domain
> to a virtual machine. :)

It's fine with me

Acked-by: Jon Derrick: <jonathan.derrick@intel.com>

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