Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits

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To: John Garry <john.g.garry@xxxxxxxxxx>
Subject: Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Mon, 21 Jul 2025 23:43:32 -0400
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Mikulas Patocka <mpatocka@xxxxxxxxxx>, <axboe@xxxxxxxxx>, <agk@xxxxxxxxxx>, <snitzer@xxxxxxxxxx>, <song@xxxxxxxxxx>, <yukuai3@xxxxxxxxxx>, <hch@xxxxxx>, <nilay@xxxxxxxxxxxxx>, <dm-devel@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-raid@xxxxxxxxxxxxxxx>, <linux-block@xxxxxxxxxxxxxxx>, <ojaswin@xxxxxxxxxxxxx>
In-reply-to: <cad33609-9a92-444b-9ff5-5f5a68598866@oracle.com> (John Garry's message of "Mon, 21 Jul 2025 15:09:24 +0100")
Organization: Oracle Corporation
References: <20250703114613.9124-1-john.g.garry@oracle.com> <20250703114613.9124-6-john.g.garry@oracle.com> <b7bd63a0-7aa6-2fb3-0a2b-23285b9fc5fc@redhat.com> <f7f342de-1087-47f6-a0c1-e41574abe985@oracle.com> <8b5e009a-9e2a-4542-69fb-fc6d47287255@redhat.com> <803d0903-2382-4219-b81e-9d676bd5de1f@oracle.com> <yq1a55edu8i.fsf@ca-mkp.ca.oracle.com> <cad33609-9a92-444b-9ff5-5f5a68598866@oracle.com>

John,

> Does pbs need to be a power-of-2?

For ATA and SCSI, definitely. NVMe could technically report a multiple
of the logical block size but I've never come across anything that
didn't report a power of two.

-- 
Martin K. Petersen

References:
- [PATCH v3 0/5] block/md/dm: set chunk_sectors from stacked dev stripe size
  - From: John Garry
- [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: John Garry
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: Mikulas Patocka
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: John Garry
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: Mikulas Patocka
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: John Garry
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: Martin K. Petersen
- Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits
  - From: John Garry

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