linux-ext4 - Re: [PATCH 2/2] Add batched discard support for ext4.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4BD59D39.5050906@teksavvy.com>
Date:	Mon, 26 Apr 2010 10:03:37 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	Greg Freemyer <greg.freemyer@...il.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>,
	Jeff Moyer <jmoyer@...hat.com>, linux-ext4@...r.kernel.org,
	Edward Shishkin <eshishki@...hat.com>,
	Eric Sandeen <esandeen@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 2/2] Add batched discard support for ext4.

On 24/04/10 03:06 PM, Martin K. Petersen wrote:
..
> Our discard implementation is meant to accommodate a wide range of
> devices.  Just because some of the currently shipping low-end consumer
> SSDs implement TRIM poorly does not mean we're going to scrap what we
> have.
..

The current implementation works extremely poorly for the singlemost
common style of hardware that's out there.  Millions and millions
of SATA SSDs, and they're becoming more and more ubiquitous.

A "solution" that ignores reality isn't very helpful.
We can do better than that, a lot better.

> We are not in the business of designing for the past.  Especially not
> when the past can be handled by a shell script.
..

We are in the business of supporting the hardware that people run Linux on.
Today, and tomorrow, and the next few years, that means SATA SSDs by the gazillions,
as well as a relatively smaller number of enterprise behemoths.

A shell script cannot currently deal with LVM, RAID, or btrfs filesystems.

Cheers
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html