Re: [PATCHv4 0/2] kvm: direct msix injection

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 27, 2012 at 09:34:57PM -0700, Alex Williamson wrote:
> On Wed, 2012-11-21 at 21:26 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 17, 2012 at 06:05:53PM +0200, Michael S. Tsirkin wrote:
> > > We can deliver certain interrupts, notably MSIX,
> > > from atomic context.
> > > Here's an untested patch to do this (compiled only).
> > > 
> > > Changes from v2:
> > > Don't inject broadcast interrupts directly
> > > Changes from v1:
> > > Tried to address comments from v1, except unifying
> > > with kvm_set_irq: passing flags to it looks too ugly.
> > > Added a comment.
> > > 
> > > Jan, you said you can test this?
> > 
> > I have tested this with some networking workloads
> > and this patchset seems to work fine.
> > My setup isn't a good fit for benchmarking device
> > assignment though.
> > Alex, could you pls verifyu that this solves the
> > latency issue that you sometimes observe?
> > With this patchset device assignment latency should be
> > as fast as vfio.
> 
> Yep, that seems to cover the gap.  My environment is too noisy to
> declare an absolute winner, but pci-assign and vfio-pci are now very,
> very similar under netperf TCP_RR with these patches.  Thanks,
> 
> Alex

Thanks very much for the report.
Gleb, Marcelo, ACK?
Also please add
Tested-by: Alex Williamson <alex.williamson@redhat.com>

-- 
MST