On Mon, Nov 04, 2019 at 03:55:41PM -0700, Jens Axboe wrote: > > All existing ones I'm aware of are 128k, so 4k aligned, but if the LBA > > format is 512B, you could start a 4k IO at a 126k offset to straddle the > > boundary. Hm, maybe we don't care about the split penalty in that case > > since unaligned access is already going to be slower for other reasons ... > > Yeah, not sure that's a huge concern for that particular case. If you > think it's a real world issue, it should be possible to set aside a > queue bit for this and always have them hit the slower split path. Well, we use that field for zoned devices also, in which case it is an issue. I think I'll need to send a patch to skip the fast path if we have chunk_sectors set.
