On Wed, Aug 02, 2023 at 11:56:11AM +0000, Parav Pandit wrote:
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From: Michael S. Tsirkin <>
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> Sent: Wednesday, August 2, 2023 5:21 PM
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> There's one thing to say about putting everything in one place, and that is that
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> one can then find everything in one place.
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> When a device grows incrementally and each functionality also,
> grouping it per functionality gives better pace to keep things self-contained.
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> Think how messy a set command would be if all 3 functionality in one set command.
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> For example, at the moment we actually do have a problem with cvq, and the
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> problem is that it sets internal device state that is not observable (unlike original
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> pre-1.0 config space which was writeable).
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> Which part is not observable?
e.g. rss config.
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> By the way there's a pci express ECN for relaxed ordering or something like this.
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> I am yet to look at it, I wonder whether it can be used to avoid the issues we
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> have with MMIO in a way that is easier to use than DMA.
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> Waiting to deliver new features on new PCI standard will drastically slow down virtio.
features? surely not. but when we are building a new transport then
we are building for the future, it takes years for a new
transport to be deployed.
> I don't think its good idea, but I would like to know about such ECN, if there is one.
I am talking about unordered IO (UIO)
ECN.
