linux-kernel - Re: BUG: writing '0' to queue/rotational causes system hang

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Date:	Wed, 03 Jun 2009 15:52:19 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: BUG: writing '0' to queue/rotational causes system hang

Kok, Auke wrote:
> I stumbled into the following bug on an Acer Aspire 1 running moblin2-beta: The
> drive misidentifies itself as being 'rotational' even though it's an SSD drive.
> drive/model = "SSDPAMM0008G1EA" - the standard 8gb SSD provided with Acer Aspire
> one models.
> 
> Tuning 'rotational' to '0' at boot time causes the system to hard lock up. We're
> attempting to do this tuning early in the boot phase in order to get the right
> queueing and possibly improve startup time, so there is a lot of IO going on at
> the moment.
> 
> Not sure what the real cause it so far. Test case is a simple "echo 0 >
> /sys/block/sda/queue/rotational". Doing this at idle time has no effect, so I
> suspect a race with the IO scheduler.

PEBKAC, pls ignore :)

Auke
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