linux-kernel - Re: ext4 bug ? "Intel 320 SSD write performance

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Message-ID: <4EAFF54C.7010406@earthlink.net>
Date:	Tue, 01 Nov 2011 09:34:04 -0400
From:	Stephen Clark <sclark46@...thlink.net>
To:	Ted Ts'o <tytso@....edu>,
	Vincent Pelletier <plr.vincent@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: ext4 bug ? "Intel 320 SSD write performance – contd."

On 10/31/2011 05:09 PM, Ted Ts'o wrote:
> On Mon, Oct 31, 2011 at 09:38:37PM +0100, Vincent Pelletier wrote:
>    
>> Reading this blog post[1], I thought the "2nd iteration" results could be
>> considered a bug in mkfs.ext4 (and possibly any mkfs implementation):
>> shouldn't mkfs run [FI]TRIM on its target before creating filesystem
>> structure ?
>>      
> It's not enabled by default, because there are crappy SSD's out there
> where use of the TRIM command will turn them into bricks.  (No, it's
> not the Intel X-25 drives that I'm worried about.)
>
> So I (and the distributions) don't want to make it the default, since
> if you buy crap drives and then mke2fs turns them into bricks, who are
> you likely to blame?  The crap SSD manufacturer?  Yourself for trying
> to buy SSD's on the cheap?  Or the program that issued the TRIM
> command?
>
> You can enable the trim behaviour by default by adding to your
> /etc/mke2fs.conf file:
>
> [defaults]
> 	discard = true
>
> But then it's on your head if anything bad happens.  :-/
>
>          	      	      	      - Ted
>
>    
<snip>

What about using discard in fstab like:
LABEL=/ /                      ext4    
defaults,discard,noatime,nodiratime        1 1

Thanks,
Steve

-- 

"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty
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