linux-ext4 - Re: Ext4: batched discard support

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Message-ID: <20100723151925.GI13090@thunk.org>
Date:	Fri, 23 Jul 2010 11:19:25 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Lukas Czerner <lczerner@...hat.com>, eshishki@...hat.com,
	rwheeler@...hat.com, linux-ext4@...r.kernel.org, sandeen@...hat.com
Subject: Re: Ext4: batched discard support - simplified version

On Fri, Jul 23, 2010 at 11:13:52AM -0400, Jeff Moyer wrote:
> 
> I don't think so.  In all of the configurations tested, I'm pretty sure
> we saw a performance hit from doing the TRIMs right away.  The queue
> flush really hurts.  Of course, I have no idea what you had in mind for
> the amount of time in between batched discards.

Sure, but not all the world is SATA-attached SSD's.  I'm thinking in
particular of PCIe-attached SSD's, where the TRIM command might be
very fast indeed...  I believe Ric Wheeler tells me you have TMS
RamSan SSD's in house that you are testing?  And of course those
aren't the only PCIe-attached flash devices out there....

       	   		      	    	    	- Ted
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