linux-kernel - Re: Stop SSD from waiting for "Spinning up disk..."

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Date:	Tue, 23 Jun 2015 20:27:46 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: Stop SSD from waiting for "Spinning up disk..."

On Tue, Jun 23, 2015 at 5:02 PM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> On Mon, Jun 22, 2015 at 11:36 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
>> On Mon, Jun 22, 2015 at 03:25:29PM +0800, Jeff Chua wrote:
>>>
>>> There's no need to wait for disk spin-up for USB SSD devices. This patch
>>> allow the SSD to skip waiting disk spin-up by passing sd_mod.ssd=1 during
>>> boot-up.
>>>
>>> If there's a better way to handle this, please share.
>>
>> Module parameters are never a solution for a device-specific property,
>> sorry.
>
> Greg,
>
> SSD is coming mainstream and it doesn't make sense wasting time
> spinning up "disk" ...

I don't think Greg disputes that. He just objects to the solution (a
module parameter) you proposed. I'd guess that detecting that we're
talking to an SSD and then skipping the wait would make more sense, if
at all possible.

Frans
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