Messages in this thread | | | Date | Tue, 04 Nov 2008 15:23:42 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 1/3] block: add queue flag for paravirt frontend drivers |
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Jens Axboe wrote: > On Mon, Oct 27 2008, Fernando Luis Vázquez Cao wrote: > >> As is the case with SSD devices, we do not want to idle in AS/CFQ when >> the block device is a paravirt front-end driver. This patch adds a flag >> (QUEUE_FLAG_VIRT) which should be used by front-end drivers such as >> virtio_blk and xen-blkfront to indicate a paravirtualized device. >> > > All three patches look fine, although we could just reuse > QUEUE_FLAG_NONROT directly. But I agree it makes sense to make the > distinction, so I've just applied 1-3. >
I guess in theory you could imagine that the virtual device is mapped directly onto a physical device, and the host OS does no scheduling, in which case it would be appropriate for the guest do the work. But I think otherwise this makes sense.
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