Il 05/07/2012 12:29, Jason Wang ha scritto:

Sometimes, virtio device need to configure irq affiniry hint to maximize the
performance. Instead of just exposing the irq of a virtqueue, this patch
introduce an API to set the affinity for a virtqueue.

The api is best-effort, the affinity hint may not be set as expected due to
platform support, irq sharing or irq type. Currently, only pci method were
implemented and we set the affinity according to:

- if device uses INTX, we just ignore the request
- if device has per vq vector, we force the affinity hint
- if the virtqueues share MSI, make the affinity OR over all affinities
 requested

Signed-off-by: Jason Wang <jasowang@redhat.com>

It looks like both I and Jason will need these patches during the 3.7
merge window, and from different trees (net-next vs. scsi).  How do we
synchronize?

Paolo