From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
Jens Axboe <axboe@kernel.dk>, Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Zdenek Kabelac <zkabelac@redhat.com>,
Milan Broz <gmazyland@gmail.com>,
linux-block@vger.kernel.org, dm-devel@lists.linux.dev
Subject: Re: [PATCH] blk-settings: round down io_opt to at least 4K
Date: Tue, 04 Feb 2025 21:41:36 -0500 [thread overview]
Message-ID: <yq1cyfxdsmz.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <00717ba6-0ce9-5ccd-d93d-ce5db89d85ff@redhat.com> (Mikulas Patocka's message of "Tue, 4 Feb 2025 15:56:11 +0100 (CET)")
Mikulas,
> If there is some particular SSD that has more write IOPS for 8k requests
> than for 4k requests, I'd like to know about it - out of curiosity.
SSD blocks are getting bigger and bigger, some drives hide it better
than others. Also look at all the efforts going on wrt. supporting
larger block sizes in the kernel.
Can you send me the output of:
# sg_vpd -p bl /dev/sdN
and maybe hdparm -I too? I'd like to see if we can come up with a
reasonable heuristic.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2025-02-05 2:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-20 15:16 [PATCH] blk-settings: round down io_opt to at least 4K Mikulas Patocka
2025-01-22 6:12 ` Christoph Hellwig
2025-02-03 13:38 ` Mikulas Patocka
2025-02-03 19:02 ` Martin K. Petersen
2025-02-03 21:05 ` Mikulas Patocka
2025-02-04 3:30 ` Martin K. Petersen
2025-02-04 5:57 ` Christoph Hellwig
2025-02-04 13:02 ` Martin K. Petersen
2025-02-04 13:50 ` Christoph Hellwig
2025-02-05 2:36 ` Martin K. Petersen
2025-02-05 16:00 ` Christoph Hellwig
2025-02-04 14:56 ` Mikulas Patocka
2025-02-05 2:41 ` Martin K. Petersen [this message]
2025-02-10 12:54 ` Mikulas Patocka
2025-02-10 17:02 ` Milan Broz
2025-02-04 5:56 ` Christoph Hellwig
2025-02-04 5:55 ` Christoph Hellwig
2025-01-23 12:24 ` Milan Broz
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