Subject: Re: [net-next RFC V5 3/5] virtio: intorduce an API to set affinity for a virtqueue

From: Paolo Bonzini <[email-masked]>
Date: Thu, 09 Aug 2012 17:13:37 +0200

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 <[email-masked]>

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