linux-ext4 - Re: How capacious and well-indexed are ext4, xfs and btrfs directories?

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Message-ID: <YKyEi06Y8uNCr9BE@infradead.org>
Date:   Tue, 25 May 2021 06:00:59 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Josh Triplett <josh@...htriplett.org>,
        Andreas Dilger <adilger@...ger.ca>,
        David Howells <dhowells@...hat.com>,
        Theodore Ts'o <tytso@....edu>, Chris Mason <clm@...com>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        xfs <linux-xfs@...r.kernel.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        linux-cachefs@...hat.com,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        NeilBrown <neilb@...e.com>
Subject: Re: How capacious and well-indexed are ext4, xfs and btrfs
 directories?

On Mon, May 24, 2021 at 09:21:36PM -0700, Darrick J. Wong wrote:
> Synchronous discard is slow, even on NVME.

That really depends on the device.  Some are specifically optimized for
that workload due to customer requirements.