+Lorenzo On Fri, 2018-05-11 at 09:39 -0600, Jonathan Derrick wrote: > 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@xxxxxxxxx> We've seen this actually fix an issue with one vendor's multi-function switch. I'd like to see it get into 4.18 if possible
