Re: Fall back io scheduler for 2.6.15?

[Chuck Ebbert]

In-Reply-To: <20060113174914.7907bf2c.akpm@xxxxxxxx>

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@xxxxxxxxxxxxxx>

--- 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.
  	 */
-- 
Chuck
Currently reading: _Olympos_ by Dan Simmons
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