From: Bart Van Assche <bvanassche@acm.org>
To: Theodore Tso <tytso@mit.edu>, Jaegeuk Kim <jaegeuk@kernel.org>
Cc: linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
Matthew Wilcox <willy@infradead.org>,
linux-f2fs-devel@lists.sourceforge.net,
Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
Akilesh Kailash <akailash@google.com>,
Christian Brauner <christian@brauner.io>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: another way to set large folio by remembering inode number
Date: Tue, 26 May 2026 09:14:52 -0700 [thread overview]
Message-ID: <f4e521ac-2381-49ca-8dcc-3cb3cf3ffaea@acm.org> (raw)
In-Reply-To: <ybmbjekuvzmaw4hmlxd7nxs546dqtwmxqxwyali74d6m3u7tat@b4q3japqnhrl>
On 5/26/26 6:42 AM, Theodore Tso wrote:
> It seems... surprising that the additional I/O operations are actually
> throttloing UFS device bandwidth by 2x (4GB/s vs 2GB/s). Have you dug
> into why this is happening, and whether there is anything that can be
> optimized below the file system?
The layers below the filesystem (block, SCSI, UFS) is what I'm
responsible for in the Pixel team and I can assure you that these are
highly optimized.
Since the transfer size used in Jaegeuk's tests is much larger than 4
KiB, how many CPU cycles are used per IO by the layers below the
filesystem is not limiting the transfer bandwidth.
Bart.
next prev parent reply other threads:[~2026-05-26 16:15 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260409134538.3692605-1-jaegeuk@kernel.org>
[not found] ` <adhPZxtbZxgU-37v@google.com>
2026-04-14 8:02 ` [PATCH v2] f2fs: another way to set large folio by remembering inode number Christoph Hellwig
2026-04-15 16:44 ` Jaegeuk Kim
2026-04-15 17:15 ` Matthew Wilcox
2026-04-15 22:02 ` Jaegeuk Kim
2026-04-15 23:49 ` Darrick J. Wong
2026-04-16 1:19 ` Jaegeuk Kim
2026-05-21 8:51 ` Christoph Hellwig
2026-05-21 15:57 ` Theodore Tso
2026-05-21 17:42 ` Matthew Wilcox
2026-05-22 3:59 ` Jaegeuk Kim
2026-05-22 12:55 ` Matthew Wilcox
2026-05-22 14:04 ` [f2fs-dev] " Jaegeuk Kim
2026-05-25 5:34 ` Christoph Hellwig
2026-05-26 1:21 ` Jaegeuk Kim
2026-05-26 2:31 ` Matthew Wilcox
2026-05-26 3:47 ` Jaegeuk Kim
2026-05-25 5:34 ` Christoph Hellwig
2026-05-22 3:32 ` [f2fs-dev] " Jaegeuk Kim
2026-05-22 3:53 ` Eric Biggers
2026-05-22 4:02 ` Jaegeuk Kim
2026-05-22 10:01 ` Christian Brauner
2026-05-22 14:11 ` Theodore Tso
2026-05-22 17:08 ` Jaegeuk Kim
2026-05-22 22:41 ` Theodore Tso
2026-05-26 1:10 ` Jaegeuk Kim
2026-05-26 2:35 ` Matthew Wilcox
2026-05-26 3:34 ` Jaegeuk Kim
2026-05-26 3:35 ` Randy Dunlap
2026-05-26 4:12 ` Jaegeuk Kim
2026-05-26 13:42 ` Theodore Tso
2026-05-26 16:14 ` Bart Van Assche [this message]
2026-05-26 21:52 ` Jaegeuk Kim
2026-05-25 5:37 ` Christoph Hellwig
2026-05-22 9:59 ` Christian Brauner
2026-04-15 16:41 ` Jaegeuk Kim
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=f4e521ac-2381-49ca-8dcc-3cb3cf3ffaea@acm.org \
--to=bvanassche@acm.org \
--cc=akailash@google.com \
--cc=christian@brauner.io \
--cc=hch@infradead.org \
--cc=jaegeuk@kernel.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-f2fs-devel@lists.sourceforge.net \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tytso@mit.edu \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox