[LinuxBIOS] dual core disable?

Lu, Yinghai yinghai.lu at amd.com
Tue Nov 8 01:33:08 CET 2005


Northbridge.c cpu_bus_scan need to be modified too, you need to assume
the CONFIG_LOGICAL_CPU==1 there..

YH

-----Original Message-----
From: linuxbios-bounces at openbios.org
[mailto:linuxbios-bounces at openbios.org] On Behalf Of Lu, Yinghai
Sent: Monday, November 07, 2005 3:55 PM
To: Greg Johnson
Cc: linuxbios at openbios.org
Subject: Re: [LinuxBIOS] dual core disable?

OK, 

We may need to set the nbcfg 54 bit even disable the dual core.

Please several lines
1. src/cpu/dualcore/dualcore.c 
//If(read_option(CMOS_VSTART_dual_core.....
2. in you cache_as_ram_auto.c
//#if CONFIG_LOGICAL_CPUS == 1
	Set_apicid_cpuid_lo();
//#endif

YH


-----Original Message-----
From: Greg Johnson [mailto:gjohnson at lanl.gov] 
Sent: Monday, November 07, 2005 3:37 PM
To: Lu, Yinghai
Cc: Ronald G Minnich; Greg Johnson; linuxbios at openbios.org
Subject: Re: [LinuxBIOS] dual core disable?

On Mon, Nov 07, 2005 at 03:00:09PM -0800, Lu, Yinghai wrote:
> ?
> 
> In Normal BIOS, is there option to disable dual core?
> 

No.  I'm pretty sure that I'm really getting two cores on one socket.
Memory bandwidth is affected when running on both cores.  In any case,
Linux K8 NUMA is confused:

p5:~# numactl --show
policy: default
preferred node: current
cpubind: 0
membind: 0 1

Greg



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