From: Matthew Wilcox <willy@infradead.org>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Andres Freund <andres@anarazel.de>,
linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: fallocate(FALLOC_FL_ZERO_RANGE_BUT_REALLY) to avoid unwritten extents?
Date: Mon, 4 Jan 2021 19:24:33 +0000 [thread overview]
Message-ID: <20210104192433.GC22407@casper.infradead.org> (raw)
In-Reply-To: <X/NpsZ8tSPkCwsYE@mit.edu>
On Mon, Jan 04, 2021 at 02:17:05PM -0500, Theodore Ts'o wrote:
> One thing to note is that there are some devices which support a write
> zeros operation, but where it is *less* performant than actually
> writing zeros via DMA'ing zero pages. Yes, that's insane.
> Unfortunately, there are a insane devices out there....
We already have quirks to disable commands, in NVMe, SCSI and ATA.
This sounds like another quirk to throw on the bonfire ("Yes, this
device claims to support Write Zeroes, but don't use it"). Indeed,
NVMe already has precisely this quirk, NVME_QUIRK_DISABLE_WRITE_ZEROES.
next prev parent reply other threads:[~2021-01-04 19:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-30 6:28 fallocate(FALLOC_FL_ZERO_RANGE_BUT_REALLY) to avoid unwritten extents? Andres Freund
2021-01-04 18:19 ` Darrick J. Wong
2021-01-04 19:10 ` Andres Freund
2021-01-04 19:57 ` Avi Kivity
2021-01-12 18:16 ` Christoph Hellwig
2021-01-12 18:39 ` Andreas Dilger
2021-01-12 18:43 ` Christoph Hellwig
2021-01-12 18:51 ` Andreas Dilger
2021-01-12 21:14 ` Darrick J. Wong
2021-01-12 21:36 ` Andres Freund
2021-01-13 7:44 ` Avi Kivity
2021-01-19 3:44 ` Andreas Dilger
2021-01-04 19:17 ` Theodore Ts'o
2021-01-04 19:24 ` Matthew Wilcox [this message]
2021-01-04 20:29 ` Andres Freund
2021-01-04 22:40 ` Eric Sandeen
2021-01-06 22:52 ` Dave Chinner
2021-01-06 23:40 ` Andres Freund
2021-01-08 20:32 ` Dave Chinner
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