From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
aalbersh@kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 1/2] mkfs: enable new features by default
Date: Tue, 2 Dec 2025 22:31:22 -0800 [thread overview]
Message-ID: <aS_ZOpzcp04ovBwk@infradead.org> (raw)
In-Reply-To: <20251203005345.GD89492@frogsfrogsfrogs>
On Tue, Dec 02, 2025 at 04:53:45PM -0800, Darrick J. Wong wrote:
> On Mon, Dec 01, 2025 at 11:38:46PM -0800, Christoph Hellwig wrote:
> > On Mon, Dec 01, 2025 at 05:28:16PM -0800, Darrick J. Wong wrote:
> > > From: Darrick J. Wong <djwong@kernel.org>
> > >
> > > Since the LTS is coming up, enable parent pointers and exchange-range by
> > > default for all users. Also fix up an out of date comment.
> >
> > Do you have any numbers that show the overhead or non-overhead of
> > enabling rmap? It will increase the amount of metadata written quite
> > a bit.
>
> I'm assuming you're interested in the overhead of *parent pointers* and
> not rmap since we turned on rmap by default back in 2023?
Yes, sorry.
> I see more or less the same timings for the nine subsequent runs for
> each parent= setting. I think it's safe to say the overhead ranges
> between negligible and 10% on a cold new filesystem.
Should we document this cleary? Because this means at least some
workloads are going to see a performance decrease.
next prev parent reply other threads:[~2025-12-03 6:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-02 1:27 [PATCHSET 2/2] xfsprogs: enable new stable features for 6.18 Darrick J. Wong
2025-12-02 1:28 ` [PATCH 1/2] mkfs: enable new features by default Darrick J. Wong
2025-12-02 7:38 ` Christoph Hellwig
2025-12-03 0:53 ` Darrick J. Wong
2025-12-03 6:31 ` Christoph Hellwig [this message]
2025-12-04 18:48 ` Darrick J. Wong
2025-12-02 1:28 ` [PATCH 2/2] mkfs: add 2025 LTS config file Darrick J. Wong
-- strict thread matches above, loose matches on Subject: below --
2025-12-09 16:16 [PATCHSET V2] xfsprogs: enable new stable features for 6.18 Darrick J. Wong
2025-12-09 16:16 ` [PATCH 1/2] mkfs: enable new features by default Darrick J. Wong
2025-12-09 16:22 ` Christoph Hellwig
2025-12-09 22:25 ` Dave Chinner
2025-12-10 23:49 ` Darrick J. Wong
2025-12-15 23:59 ` Dave Chinner
2025-12-16 23:07 ` Darrick J. Wong
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