linux-kernel - Re: [PATCH 6/7] block: allow large discard requests

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Date:	Sat, 29 Aug 2009 22:52:59 -0400
From:	Mark Lord <liml@....ca>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Christoph Hellwig <hch@...radead.org>, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com, dwmw2@...radead.org
Subject: Re: [PATCH 6/7] block: allow large discard requests

Matthew Wilcox wrote:
> On Sat, Aug 29, 2009 at 10:49:02PM -0400, Mark Lord wrote:
>> Pardon my cursory review, but I don't see where this
>> patch set allows for more than a single extent/range
>> of sectors per TRIM command.
> 
> It doesn't.
> 
>> If it still does not group many extents into a single TRIM,
>> then it will be far to slow to be useful at all for SATA.
> 
> That depends on the firmware.  I do have plans to group the extents,
> but let's get something working before making it quick.
..

In this situation, it's more a case of making it *not sucky slow*
than getting to the point where we think about making it "quick".

One extent at a time is glacial.

Cheers

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