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Subject: thoughts on: virtio: skipping used buffers without IN_ORDER
Hello! At the moment, if a device uses multiple buffers, it has to write out a descriptor per buffer. The only exception is with IN_ORDER where device can skip buffers, with driver keeping track of IDs. IN_ORDER is however quite limited in what it can do. It's not a good fit for storage, and probably not for RX networking. It's not hard to extend IN_ORDER so it doesn't apply to specific rings. A harder question is still writing a single descriptor in this case. One somewhat easy fix it just to allow descriptors to include multiple IDs. E.g. address is ignored in used descriptors, we can fit 4 extra IDs in there. For descriptors where we don't care about the length, we can stick a couple more IDs on top of that. I can't say it's all very elegant. Also, is that enough of a win? We can still end up with multiple descriptors. More thoughts? Thanks, -- MST
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