From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: John Dorminy <jdorminy@redhat.com>
Cc: Harshad Shirwadkar <harshadshirwadkar@gmail.com>,
linux-block@vger.kernel.org, tytso@mit.edu,
"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: [PATCH] block: add split_alignment for request queue
Date: Mon, 15 Jun 2020 22:25:27 -0400 [thread overview]
Message-ID: <yq1lfknoio7.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <CAMeeMh9X0zNSmyxaHCJCXT0m3eaeTzdJ=NZREXUgRmsfM1crsQ@mail.gmail.com> (John Dorminy's message of "Mon, 15 Jun 2020 22:14:05 -0400")
John,
> Reading through this change, split_alignment appears similar in my
> mind to limits->io_opt.
io_opt is a hint which requests that the submitter does not issue any
I/Os that are larger than this size. io_opt is smaller than or equal to
the device's hard limit for I/O size. In the standards space it's
described as "issuing an I/O larger than this value may incur a
processing penalty". So not quite what you're looking for.
However, we have chunk_sectors queue limit which is honored for splits.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2020-06-16 2:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 0:56 [PATCH] block: add split_alignment for request queue Harshad Shirwadkar
2020-06-16 2:14 ` John Dorminy
2020-06-16 2:25 ` Martin K. Petersen [this message]
2020-06-16 2:40 ` Ming Lei
2020-06-16 2:50 ` harshad shirwadkar
2020-06-16 3:24 ` harshad shirwadkar
2020-06-16 4:16 ` Ming Lei
2020-06-16 7:29 ` Christoph Hellwig
2020-06-16 11:12 ` Sweet Tea Dorminy
2020-06-16 14:38 ` Christoph Hellwig
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