From: Christoph Hellwig <hch@lst.de>
To: Uladzislau Rezki <urezki@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>,
Alasdair Kergon <agk@redhat.com>, DMML <dm-devel@lists.linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Snitzer <snitzer@redhat.com>, Christoph Hellwig <hch@lst.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RESEND PATCH] dm-ebs: Mark full buffer dirty even on partial write
Date: Tue, 18 Nov 2025 13:46:23 +0100 [thread overview]
Message-ID: <20251118124623.GA32286@lst.de> (raw)
In-Reply-To: <aRxpPFQmbB0wnmM7@milan>
On Tue, Nov 18, 2025 at 01:40:28PM +0100, Uladzislau Rezki wrote:
> > If logical < physical, then the device performs read-modify-write cycle
> > when writing blocks that are not aligned at physical block size.
> >
> This is not true. It depends on your device and specification. If it
> can't there is the dm-ebs that does the job.
Logical blocks size is the access unit. Physical block size is a hint
that the device might be doing RWF and thus be slow. What driver/device
are using? Whatever it is doing is completely broken.
(that being said aligning things to the physical block size as much
as possible is usually still a good optimization, that's why the
value exists).
next prev parent reply other threads:[~2025-11-18 12:46 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-17 10:59 [RESEND PATCH] dm-ebs: Mark full buffer dirty even on partial write Uladzislau Rezki (Sony)
2025-11-17 20:48 ` Mikulas Patocka
2025-11-18 11:39 ` Uladzislau Rezki
2025-11-18 12:00 ` Mikulas Patocka
2025-11-18 12:40 ` Uladzislau Rezki
2025-11-18 12:46 ` Christoph Hellwig [this message]
2025-11-18 14:15 ` Benjamin Marzinski
2025-11-18 17:21 ` Mikulas Patocka
2025-11-19 5:46 ` Christoph Hellwig
2025-11-19 8:43 ` Uladzislau Rezki
2025-11-19 8:53 ` Christoph Hellwig
2025-11-19 8:57 ` Uladzislau Rezki
2025-11-19 9:00 ` Christoph Hellwig
2025-11-19 9:01 ` Uladzislau Rezki
2025-11-19 9:05 ` Christoph Hellwig
2025-11-19 9:13 ` Uladzislau Rezki
2025-11-19 9:17 ` Christoph Hellwig
2025-11-19 17:26 ` Mikulas Patocka
2025-11-20 6:21 ` Christoph Hellwig
2025-11-20 12:08 ` Uladzislau Rezki
2025-11-20 12:40 ` Uladzislau Rezki
2025-11-21 7:25 ` Christoph Hellwig
2025-11-21 7:24 ` Christoph Hellwig
2025-11-21 13:21 ` Uladzislau Rezki
2025-11-21 16:48 ` Benjamin Marzinski
2025-11-24 10:43 ` Uladzislau Rezki
2025-11-24 14:30 ` Christoph Hellwig
2025-11-24 15:30 ` Uladzislau Rezki
2025-11-24 17:00 ` Christoph Hellwig
2025-11-24 18:05 ` Uladzislau Rezki
-- strict thread matches above, loose matches on Subject: below --
2025-10-14 14:47 Uladzislau Rezki (Sony)
2025-10-16 19:59 ` Andrew Morton
2025-10-17 15:55 ` Uladzislau Rezki
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