Bug 10710

Summary:	[BISECTED] Lots of "rescheduling IPIs" in powertop
Product:	Platform Specific/Hardware	Reporter:	Rafael J. Wysocki (rjw)
Component:	x86-64	Assignee:	platform_x86_64 (platform_x86_64)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	andi-bz, bunk, kerneloopses, mingo
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	Commit 0c07ee38c9d4eb081758f5ad14bbffa7197e1aec	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	10492

Description Rafael J. Wysocki 2008-05-15 15:34:52 UTC

Subject    : [BISECTED] Lots of "rescheduling IPIs" in powertop
Submitter  : Vegard Nossum <vegard.nossum@gmail.com>
Date       : 2008-05-13 20:42
References : http://marc.info/?l=linux-kernel&m=121071176205864&w=4
Handled-By : Andi Kleen <andi@firstfloor.org>
Handled-By : Arjan van de Ven <arjan@infradead.org>
Handled-By : Ingo Molnar <mingo@elte.hu>
Patch      : http://marc.info/?l=linux-kernel&m=121074826823352&w=4

This entry is being used for tracking a regression from 2.6.25.  Please don't
close it until the problem is fixed in the mainline.

Comment 1 Rafael J. Wysocki 2008-05-15 15:36:43 UTC

Caused by:

commit 0c07ee38c9d4eb081758f5ad14bbffa7197e1aec
Author: Andi Kleen <ak@suse.de>
Date:   Wed Jan 30 13:33:16 2008 +0100

    x86: use the correct cpuid method to detect MWAIT support for C states

    Cc: "Andreas Herrmann" <andreas.herrmann3@amd.com>
    Signed-off-by: Andi Kleen <ak@suse.de>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Comment 2 Andi Kleen 2008-05-15 17:30:29 UTC

I don't think that's correct in the regression list. It is currently
not clear it is even a regression. There's a fair chance it is actually
correct behavior on that box.

Comment 3 Rafael J. Wysocki 2008-05-20 15:26:26 UTC

Regressions list annotation:
References : http://lkml.org/lkml/2008/5/18/120

Comment 4 Adrian Bunk 2008-05-25 11:21:28 UTC

fixed by commit a738d897b7b03b83488ae74a9bc03d26a2875dc6