[virtio-comment] Re: [PATCH v3 6/8] admin: Add theory of operation for write recording commands

["Zhu, Lingshan" <lingshan.zhu@intel.com>]

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
>
>> 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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