From: Tejun Heo <htejun@gmail.com>
To: ric@emc.com
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-ide@vger.kernel.org, Jeff Garzik <jgarzik@pobox.com>,
Mark Lord <mlord@pobox.com>
Subject: Re: error handling - DMA to PIO step down sequence
Date: Fri, 22 Sep 2006 01:58:53 +0900 [thread overview]
Message-ID: <4512C4CD.80000@gmail.com> (raw)
In-Reply-To: <4512C2C0.9010503@emc.com>
Ric Wheeler wrote:
> Alan Cox wrote:
>> Ar Iau, 2006-09-21 am 12:26 -0400, ysgrifennodd Ric Wheeler:
>>
>>>>> Would this be a reasonable thing for a config option? Better to add
>>>>> yet another blacklist for devices that might have a justified need
>>>>> for this derating?
>>
>> I think so. I've got "Adding a set of flags to blacklist entries" on my
>> todo list so that we can indicate and deal with different kinds of
>> horkage.
>
> That could be very useful - flag specific drives to disable NCQ
> (regardless of the internal setting for drive queue depth) and so on.
Yeap, in general, we need a blacklist. For example, some drives only do
NCQ w/ only 16 or so commands or others have completely broken NCQ
support. But I don't think the broken read log page 10h needs a
blacklist entry. It can be easily handled by good default behavior.
--
tejun
prev parent reply other threads:[~2006-09-21 16:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-20 19:03 error handling - DMA to PIO step down sequence Ric Wheeler
2006-09-21 15:09 ` Tejun Heo
2006-09-21 16:26 ` Ric Wheeler
2006-09-21 17:04 ` Alan Cox
2006-09-21 16:50 ` Ric Wheeler
2006-09-21 16:58 ` Tejun Heo [this message]
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