linux-kernel - Re: General question (scheduler) with SSDs?

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Message-ID: <20090220142705.GA429@silver.sucs.org>
Date:	Fri, 20 Feb 2009 14:27:05 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Justin Piszcz <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: General question (scheduler) with SSDs?

On Fri, Feb 20, 2009 at 02:23:38PM +0100, Kay Sievers wrote:
> On Fri, Feb 20, 2009 at 14:12, Sitsofe Wheeler <sitsofe@...oo.com> wrote:
> >
> > I tried
> > SUBSYSTEM=="block", ATTRS{model}=="ASUS-PHISON *", ATTR{queue/rotational}="0"
> > but udevtest /sys/block/sda/ doesn't list it as firing (udev 117-8)...
> 
> I does here:
>   udev_rules_apply_to_event: ATTR '/sys/devices/ ...
> /sdb/queue/rotational' writing '0'
> 
>   $grep . /sys/class/block/*/queue/rotational
>   /sys/class/block/sda/queue/rotational:1
>   /sys/class/block/sdb/queue/rotational:0
> 
> Maybe "udevtest" is not showing it for you, or udev 117 is too old and
> does not work that way.

After you mentioned this I tried again and seemingly I was mistaken - it
does work as you described. I had to make a slight rule tweak to stop
it matching on partitions though:

SUBSYSTEM=="block", KERNEL=="[sh]d[a-z]", ATTRS{model}=="ASUS-PHISON *", ATTR{queue/rotational}="0"
SUBSYSTEM=="block", KERNEL=="[sh]d[a-z]", ATTRS{idVendor}=="0951", ATTRS{idProduct}=="1606", ATTR{queue/rotational}="0"
SUBSYSTEM=="block", KERNEL=="[sh]d[a-z]", ATTRS{manufacturer}=="SanDisk", ATTRS{product}=="Cruzer Micro", ATTR{queue/rotational}="0"

Thanks!

-- 
Sitsofe | http://sucs.org/~sits/
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