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

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Message-ID: <49D99775.9030104@garzik.org>
Date:	Mon, 06 Apr 2009 01:47:33 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Mark Lord <lkml@....ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	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

Arjan van de Ven wrote:
> On Sun, 05 Apr 2009 16:57:21 -0400
> Jeff Garzik <jeff@...zik.org> wrote:
>> 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 :/
> 
> you mean the "rpm" set to '1' ?
> I was pretty sure that that was industry standard...

A -new- industry standard.  You can certainly create a compliant SSD 
while only conforming to ATA-7, for example.  Some older IDE flash 
devices pretend they are normal hard drives in almost every respect, too.

	Jeff



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