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Subject: Re: [PATCH v3 6/8] admin: Add theory of operation for write recording commands
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 andThat 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
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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