Re: [PATCH] block: Improve read ahead size for rotational devices

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On Mon, Jun 16, 2025 at 05:24:43PM -0400, Martin K. Petersen wrote:
> > For a SCSI disk, this defaults to 2560 KB, which significantly improve
> > performance for buffered reads.
> 
> I believe this number came from a common RAID stripe configuration at
> the time. However, it's really not a great default and has caused
> problems with many devices that expect a power of two. Personally, I'd
> like this default to be something like 2MB or 4MB. MD, DM, and most
> hardware RAID devices report their stripe width correctly so the
> existing "RAID-friendly" default really shouldn't be needed.

Yeah, that number always felt weird.  I'm all for using a more
round value here.  But as you said, separate isue.





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