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?
Date: Mon, 16 Jan 2006 09:43:38 +0100 [thread overview]
Message-ID: <20060116084336.GO3945@suse.de> (raw)
In-Reply-To: <200601141113_MC3-1-B5DA-F6EC@compuserve.com>
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
next prev parent reply other threads:[~2006-01-16 8:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-14 16:10 Fall back io scheduler for 2.6.15? Chuck Ebbert
2006-01-16 8:43 ` Jens Axboe [this message]
2006-01-19 19:38 ` Nate Diller
2006-01-21 6:14 ` Tejun Heo
2006-01-21 11:44 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2005-04-05 3:51 ext3 allocate-with-reservation latencies Lee Revell
2005-04-07 13:08 ` Stephen C. Tweedie
2005-04-07 23:37 ` Mingming Cao
2005-04-08 14:40 ` Stephen C. Tweedie
2005-04-08 18:10 ` Mingming Cao
2005-04-11 11:48 ` Stephen C. Tweedie
2005-04-11 18:38 ` Mingming Cao
2005-04-11 19:57 ` Stephen C. Tweedie
2005-04-12 6:41 ` Mingming Cao
2005-04-12 11:18 ` Stephen C. Tweedie
2005-04-12 23:27 ` Mingming Cao
2005-04-13 10:29 ` Stephen C. Tweedie
2005-04-22 22:10 ` [RFC][PATCH] Reduce ext3 allocate-with-reservation lock latencies Mingming Cao
2005-04-28 3:45 ` Lee Revell
2005-04-28 19:14 ` [RFC] Adding multiple block allocation to current ext3 Mingming Cao
2006-01-10 23:26 ` [PATCH 0/5] " Mingming Cao
2006-01-11 5:25 ` Andrew Morton
2006-01-11 19:17 ` Mingming Cao
2006-01-11 19:43 ` Andrew Morton
2006-01-14 1:12 ` Fall back io scheduler for 2.6.15? Mingming Cao
2006-01-14 1:49 ` Andrew Morton
2006-01-14 5:22 ` Dave Jones
2006-01-16 8:43 ` Jens Axboe
2006-01-19 19:37 ` Nate Diller
2006-01-20 8:10 ` Jens Axboe
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