Re: [PATCH] md/raid5: Improve performance for sequential IO

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On Thu, Apr 20, 2023 at 02:10:02PM -0600, Logan Gunthorpe wrote:
> > I am hoping to make raid5_make_request() a little faster for non-rotational
> > devices. We may not easily observe a difference in performance, but things
> > add up. Does this make sense?
> 
> I guess. But without a performance test that shows that it makes an
> improvement, I'm hesitant about that. It could also be that it helps a
> tiny bit for non-rotational disks, but we just don't know.
> 
> Unfortunately, I don't have the time right now to do these performance
> tests.

FYI, SSDs in general do prefer sequential write streams.  For most you
won't see a different in write performance itself, but it will help with
reducing GC overhead later on.



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