Re: [PATCH] block: avoid blk_bio_segment_split for small I/O operations

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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.



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