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Subject: Re: [PATCH v3 6/8] admin: Add theory of operation for write recording commands
On Wed, Nov 15, 2023 at 12:05:59PM +0800, Zhu, Lingshan wrote: > > > On 11/14/2023 4:27 PM, Michael S. Tsirkin wrote: > > On Tue, Nov 14, 2023 at 03:34:32PM +0800, Zhu, Lingshan wrote: > > > > > So I can't > > > > > believe it has good performance overall. Logging via IOMMU or using > > > > > shadow virtqueue doesn't need any extra PCI transactions at least. > > > > On the other hand they have an extra CPU cost. Personally if this is > > > > coming from a hardware vendor, I am inclined to trust them wrt PCI > > > > transactions. But anyway, discussing this at a high level theoretically > > > > is pointless - whoever bothers with actual prototyping for performance > > > > testing wins, if no one does I'd expect a back of a napkin estimate > > > > to be included. > > > if so, Intel has released productions implementing these interfaces years > > > ago, > > > see live migration in 4.1. IFCVF vDPA Implementation, > > > https://doc.dpdk.org/guides-21.11/vdpadevs/ifc.html > > > and > > That one is based on shadow queue, right? Which I think this shows > > is worth supporting. > Yes, it is shadow virtqueue, I assume this is already mostly done, > do you see any gaps we need to address in our series that we should work on? > > Thanks There were a ton of comments posted on your series. > > > > > But I still believe we are here try our best to work out an industrial spec > > > with better quality, to serve broad interest. This is not competition > > > between companies, > > > and the spec is not a FIFO, not like a early bird can catch all the worm.
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