linux-kernel - Linux-2.6.21-rc3 : Dynticks and High resolution Timer hanging the system

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Message-ID: <20070307191252.GA6767@gromalin.logidee.com>
Date:	Wed, 7 Mar 2007 20:12:53 +0100
From:	Stephane Casset <sept@...idee.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Subject: Linux-2.6.21-rc3 : Dynticks and High resolution Timer hanging the system

Hi,

I just tryed linux-2.6.21-rc3 on my machine (P4HT 2.8GHz, with 512Mo)
with Tickless System (Dynamic Ticks) and High Resolution Timer Support
(.config in attachement)

The problem is that the kernel hang on boot. I tried different
configuration with nohz and highres on the kernel command line.

The only combination that works is : nohz=off highres=off

I also tried compiling the kernel without Tickless and without  High
resolution timer, this kernel is working ok and is one of the first
kernel to suspend and resume from RAM. Congratulations ! ;p

I tried to compile te kernel with only Tickless System or  High
Resolution timer, both hang on boot.

The hang is just after :
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 18
ICH5: chipset revision 2
ICH5: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x2040-0x2047, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0x2048-0x204f, BIOS settings: hdc:DMA, hdd:pio

And I have the message :
Switched to NOHZ mode on CPU #1
or
Switched to high resolution mode on CPU #1
Depending on the option enabled/disabled 

What can I do to help find the bug ?

dmesg and .config of the system booted with nohz=off highres=off are in
attachements.

Regards
-- 
Stéphane Casset            LOGIDÉE sàrl       Se faire plaisir d'apprendre
1a, rue Pasteur        Tel : +33 388 23 69 77           casset@...idee.com
F-67540 OSTWALD        Fax : +33 388 23 69 77           http://logidee.com

View attachment "dmesg-2.6.21rc3" of type "text/plain" (17229 bytes)

View attachment "config-2.6.21rc3" of type "text/plain" (38643 bytes)