linux-ext4 - Re: [GIT PULL] Ext3 latency fixes

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Message-ID: <49D91B31.90300@garzik.org>
Date:	Sun, 05 Apr 2009 16:57:21 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Mark Lord <lkml@....ca>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [GIT PULL] Ext3 latency fixes

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.

We set it in libata-scsi.c:ata_scsi_dev_config() based on ata_id_is_ssd()

That hueristic probably assumes Intel SSDs or something :/

	Jeff


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