On 2023/01/26 8:11, Keith Busch wrote: > On Wed, Jan 25, 2023 at 10:19:45AM +0900, Damien Le Moal wrote: >> On 1/25/23 09:05, Bart Van Assche wrote: >> >>> which it is not sure that it will be integrated in other storage >>> standards (NVMe, ...). Isn't the purpose of the block layer to provide >>> an interface that is independent of the specifics of a single storage >>> standard? This is why I'm in favor of letting the ATA core translate one >>> of the existing I/O priority classes into a CDL instead of introducing a >>> new I/O priority class (IOPRIO_CLASS_DL) in the block layer. >> >> We discussed CDL with Hannes in the context of NVMe over fabrics. Their >> may be interesting extensions to consider for NVMe in that context (the >> value for local PCI attached NVMe drive is more limited at best). > > I wouldn't necessarily rule out CDL for PCI attached in some future TP. NVMe > does allow rotating media, and they'll want feature parity if CDL is considered > useful in other protocols. True. If NVMe HDDs come to market, we'll definitely want a CDL feature too. -- Damien Le Moal Western Digital Research
