Date: Mon, 16 Jan 2006 09:43:38 +0100
From: Jens Axboe <axboe@suse.de>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel <linux-kernel@vger.kernel.org>,
       Mingming Cao <cmm@us.ibm.com>
Subject: Re: Fall back io scheduler for 2.6.15?
Message-ID: <20060116084336.GO3945@suse.de>
References: <200601141113_MC3-1-B5DA-F6EC@compuserve.com>
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On Sat, Jan 14 2006, Chuck Ebbert wrote:
> In-Reply-To: <20060113174914.7907bf2c.akpm@osdl.org>
> 
> On Fri, 13 Jan 2006, Andrew Morton wrote:
> 
> > OK.  And I assume that AS wasn't compiled, so that's why it fell back?
> 
> As of 2.6.15 you need to use "anticipatory" instead of "as".
> 
> Maybe this patch would help?
> 
> Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
> 
> --- 2.6.15a.orig/block/elevator.c
> +++ 2.6.15a/block/elevator.c
> @@ -150,6 +150,13 @@ static void elevator_setup_default(void)
>  	if (!chosen_elevator[0])
>  		strcpy(chosen_elevator, CONFIG_DEFAULT_IOSCHED);
>  
> +	/*
> +	 * Be backwards-compatible with previous kernels, so users
> +	 * won't get the wrong elevator.
> +	 */
> +	if (!strcmp(chosen_elevator, "as"))
> +		strcpy(chosen_elevator, "anticipatory");
> +
>   	/*
>   	 * If the given scheduler is not available, fall back to no-op.
>   	 */

We probably should apply this, since it used to be 'as'.

-- 
Jens Axboe

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