linux-ext4 - Re: Is TRIM/DISCARD going to be a performance problem?

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Message-ID: <20090511124822.GD8112@parisc-linux.org>
Date:	Mon, 11 May 2009 06:48:22 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	J??rn Engel <joern@...fs.org>
Cc:	Theodore Tso <tytso@....edu>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: Is TRIM/DISCARD going to be a performance problem?

On Mon, May 11, 2009 at 02:43:25PM +0200, J??rn Engel wrote:
> Given the hardware braindamage it is relatively sane.  As always, it
> would be much better to fix the problem and not add workarounds, but we
> seem to lack the gods favor this time around.
> 
> Can't anyone explain to the SATA folks that a discard is much closer to
> a write than to a secure erase or some other rare and slow command?

I've heard the ATA committee are working on an NCQ version of TRIM.
Don't expect support soon.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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