From: Tejun Heo <tj@kernel.org>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>, linux-ide <linux-ide@vger.kernel.org>
Subject: Re: [RFC] add DMA setup FIS auto-activate feature
Date: Thu, 23 Jul 2009 14:45:17 +0900 [thread overview]
Message-ID: <4A67F8ED.2070204@kernel.org> (raw)
In-Reply-To: <20090723054007.GA7473@sli10-desk.sh.intel.com>
Shaohua Li wrote:
>> IIRC, not all NCQ-capable controllers support this feature... SATA 1.0
>> hardware may not behave properly in response, no?
> It appears the AHCI spec doesn't define a HBA capability about this
> feature, but I'm likely wrong as I'm not quite familar with SATA.
IIRC, AA is in the ahci spec from rev 1.0, so if controllers implement
the spec correctly, it should work. But even for ahcis, if we enable
it by default, I'm fairly sure we'll be met by a number of unpleasant
surprises. Not sure whether doing that would be worth the trouble or
not.
Thanks.
--
tejun
next prev parent reply other threads:[~2009-07-23 5:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-23 3:45 [RFC] add DMA setup FIS auto-activate feature Shaohua Li
2009-07-23 3:50 ` Tejun Heo
2009-07-23 3:59 ` Jeff Garzik
2009-07-23 5:40 ` Shaohua Li
2009-07-23 5:45 ` Tejun Heo [this message]
2009-07-23 6:07 ` Jeff Garzik
2009-07-23 6:12 ` Tejun Heo
2009-07-23 6:48 ` Jeff Garzik
2009-07-23 7:25 ` Shaohua Li
2009-07-23 18:07 ` Robert Hancock
2009-07-23 18:11 ` Jeff Garzik
2009-07-23 20:52 ` Tejun Heo
2009-07-24 9:12 ` Shaohua Li
2009-07-25 0:47 ` Tejun Heo
2009-07-27 1:24 ` Shaohua Li
2009-07-27 1:31 ` Tejun Heo
2009-07-29 1:20 ` Jeff Garzik
2009-07-23 6:18 ` Robert Hancock
2009-07-23 9:55 ` Sergei Shtylyov
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