On Fri, Apr 18, 2025 at 09:47:54AM +0300, Leon Romanovsky wrote: > From: Kanchan Joshi <joshi.k@xxxxxxxxxxx> > > blk_rq_dma_map API is costly for single-segment requests. > Avoid using it and map the bio_vec directly. This needs to be folded into the earlier patches or split prep patches instead of undoing work done earlier, preferably combined with a bit of code movement so that the new nvme_try_setup_prp_simple stays in the same place as before and the diff shows it reusing code. E.g. change "nvme-pci: use a better encoding for small prp pool allocations" to already use the flags instead of my boolean, and maybe include abort in the flags instead of using a separate bool so that we don't increase hte iod size. Slot in a new patch after that that dropping the single SGL segment fastpath if we think we don't need that, although if we need the PRP one I suspect that one would still be very helpful as well. Add a patch if we want the try_ version of, although when keeping the optimization for SGLs as well that are will look a bit different. I'm happy to give away my patch authorship credits if that helps with the folding.
