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Date: Sat, 20 Jun 2020 13:09:24 -0400 From: "J. Bruce Fields" <bfields@...ldses.org> To: Eric Sandeen <sandeen@...deen.net> Cc: Dave Chinner <david@...morbit.com>, Masayoshi Mizuma <msys.mizuma@...il.com>, "Darrick J. Wong" <darrick.wong@...cle.com>, Christoph Hellwig <hch@...radead.org>, Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Alexander Viro <viro@...iv.linux.org.uk>, Masayoshi Mizuma <m.mizuma@...fujitsu.com>, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-xfs <linux-xfs@...r.kernel.org>, jlayton@...hat.com Subject: Re: [PATCH] fs: i_version mntopt gets visible through /proc/mounts On Sat, Jun 20, 2020 at 12:00:43PM -0500, Eric Sandeen wrote: > On 6/19/20 8:56 PM, J. Bruce Fields wrote: > > On Sat, Jun 20, 2020 at 11:49:57AM +1000, Dave Chinner wrote: > > ... > > >> However, other people have different opinions on this matter (and we > >> know that from the people who considered XFS v4 -> v5 going slower > >> because iversion a major regression), and so we must acknowledge > >> those opinions even if we don't agree with them. > > > > Do you have any of those reports handy? Were there numbers? > > I can't answer that but did a little digging. MS_I_VERSION as an option > appeared here: > ... > so the optional enablement was there on day one, without any real explanation > of why. My memory is that they didn't have measurements at first, but worried that there might be a performance issue. Which later mesurements confirmed. But that Jeff Layton's work eliminated most of that. I think ext4 was the focuse of the concern, but xfs might also have had a (less serious) regression, and btrfs might have actually had it worst? But I don't have references and my memory may be wrong. --b.
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