Re: [PATCH] blk-settings: round down io_opt to at least 4K

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Subject: Re: [PATCH] blk-settings: round down io_opt to at least 4K
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 3 Feb 2025 21:57:45 -0800
Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Alasdair Kergon <agk@xxxxxxxxxx>, Mike Snitzer <snitzer@xxxxxxxxxx>, Zdenek Kabelac <zkabelac@xxxxxxxxxx>, Milan Broz <gmazyland@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxxxxxxx
In-reply-to: <yq1bjviflwb.fsf@ca-mkp.ca.oracle.com>
References: <81b399f6-55f5-4aa2-0f31-8b4f8a44e6a4@redhat.com> <Z5CMPdUFNj0SvzpE@infradead.org> <e53588c8-77f0-5751-ad27-d6a3c4f88634@redhat.com> <yq1cyfykgng.fsf@ca-mkp.ca.oracle.com> <28dcf41a-db7d-f8e7-d6b7-acef325c758c@redhat.com> <yq1bjviflwb.fsf@ca-mkp.ca.oracle.com>

On Mon, Feb 03, 2025 at 10:30:42PM -0500, Martin K. Petersen wrote:
> I'm willing to entertain having a quirk to ignore reported values of
> 0xffff (have also seen 0xfffe) for USB-ATA bridge devices.

0xffff as the max and a weirdly uneven number even for partity RAID
seems like a good value to ignore by default.  But then again just
dealing with USB will probably catch the majority of cases.

Follow-Ups:
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
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References:
- [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Mikulas Patocka
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Christoph Hellwig
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Mikulas Patocka
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Martin K. Petersen
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Mikulas Patocka
- Re: [PATCH] blk-settings: round down io_opt to at least 4K
  - From: Martin K. Petersen

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