Subject: Re: Multiprocessor support
To: Andreas Gustafsson <email@example.com>
From: Manuel Bouyer <firstname.lastname@example.org>
Date: 09/05/2007 20:16:30
On Wed, Sep 05, 2007 at 08:05:33PM +0300, Andreas Gustafsson wrote:
> Manuel Bouyer wrote:
> > Maybe try without acpi ?
> > No need to build a new kernel to try, just
> > boot -c
> > disable acpi
> > quit
> That's easier said than done, because when running under HVM, the
> countdown after the "Press return to boot now, any other key for boot
> menu" message goes by in the blink of an eye. Maybe qemu optimizes
> away a delay loop or something?
I think it's a BIOS function that is not working properly, or maybe a timer.
I could interrupt it by keeping pressing a key while it's still in BIOS
> Anyway, I built a new kernel:
> include "arch/i386/conf/GENERIC.MP"
> no fdc0 at isa?
> no fd* at fdc?
> no acpi0 at mainbus0
> and tried it. It hung attaching the fourth CPU core:
> >> NetBSD/i386 BIOS Boot, Revision 3.3
> >> (email@example.com, Mon Aug 6 21:18:55 EEST 2007)
> >> Memory: 639/261120 k
> Press return to boot now, any other key for boot menu
> booting hd0a:netbsd - starting in 0
> 8925552+407556+361624 [439424+422099]=0xa13594
> BIOS CFG: Model-SubM-Rev: fc-00-01, 0x4074<EBDA,KBDINT,RTC,IC2,KBDF>
> Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
> 2006, 2007
> The NetBSD Foundation, Inc. All rights reserved.
> Copyright (c) 1982, 1986, 1989, 1991, 1993
> The Regents of the University of California. All rights reserved.
> NetBSD 4.99.30 (NOACPI.MP) #0: Wed Sep 5 19:55:10 EEST 2007
> total memory = 255 MB
> rbus: rbus_min_start set to 0x40000000
> avail memory = 240 MB
> mainbus0 (root)
> mainbus0: Intel MP Specification (Version 1.4) (_HVMCPU_ XEN )
> cpu0 at mainbus0 apid 0: (boot processor)
> cpu0: Intel Core 2 (Merom) (686-class), 2400.24 MHz, id 0x6f7
> cpu0: "Intel(R) Core(TM)2 Quad CPU @ 2.40GHz"
> cpu1 at mainbus0 apid 1: (application processor)
> cpu1: Intel Core 2 (Merom) (686-class), 2400.69 MHz, id 0x6f7
> cpu1: "Intel(R) Core(TM)2 Quad CPU @ 2.40GHz"
> cpu2 at mainbus0 apid 2: (application processor)
> cpu2: Intel Core 2 (Merom) (686-class), 2400.35 MHz, id 0x6f7
> cpu2: "Intel(R) Core(TM)2 Quad CPU @ 2.40GHz"
> cpu3 at mainbus0 apid 3: (application processor)
> Again, when I tried to destroy the hung VM, the system locked up.
Could be interesting to try with a netbsd-4 SMP kernel.
Also, it would be interesting to try with a DIAGNOSTIC+LOCKDEBUG kernel.
Manuel Bouyer <firstname.lastname@example.org>
NetBSD: 26 ans d'experience feront toujours la difference