linux-kernel - Re: [GIT PULL] Ext3 latency fixes

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Date:	Mon, 6 Apr 2009 10:13:56 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Mark Lord <lkml@....ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [GIT PULL] Ext3 latency fixes

On Sun, Apr 05 2009, Mark Lord wrote:
> Linus Torvalds wrote:
>>
>> Non-rotational media would tend to want the unplugging, but the block  
>> layer already does that (ie in __make_request() we already do:
>>
>>         if (unplug || blk_queue_nonrot(q))
>>                 __generic_unplug_device(q);
>>
>> so non-rotational devices get unplugged whether the request was a  
>> unplugging request or not).
> ..
>
> Mmm.. except that Jeff's SSD doesn't appear to identify itself
> as a non-rotating media.  I suppose there's a way to "quirk" that
> somewhere, though.

You can quirk it in userspace, just have it set the 'rotational' sysfs
file to 0 if it matches make/model/whatever.

-- 
Jens Axboe

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