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

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Date:	Thu, 09 Aug 2012 17:13:37 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
CC:	mst@...hat.com, mashirle@...ibm.com, krkumar2@...ibm.com,
	habanero@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, edumazet@...gle.com,
	tahm@...ux.vnet.ibm.com, jwhan@...ewood.snu.ac.kr,
	davem@...emloft.net, kvm@...r.kernel.org, sri@...ibm.com
Subject: Re: [net-next RFC V5 3/5] virtio: intorduce an API to set affinity
 for a virtqueue

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@...hat.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
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