linux-kernel - Re: [RFC PATCH 0/4] Gang scheduling in CFS

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Date:	Tue, 27 Dec 2011 07:17:35 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, peterz@...radead.org,
	linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com,
	bharata@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS

On Mon, 26 Dec 2011 13:41:04 +0200, Avi Kivity <avi@...hat.com> wrote:
> On 12/26/2011 01:33 PM, Nikunj A Dadhania wrote:
> 
> > I have enabled the following in my config;
> >
> > [root@...1 linux-tip]# grep X2APIC .config
> > CONFIG_X86_X2APIC=y
> > [root@...1 linux-tip]#
> >
> > And booted the kernel with "apic=verbose" command. 
> >
> > [root@...1 linux-tip]# dmesg | grep -i x2apic
> > [root@...1 linux-tip]# 
> >
> > Does not give anything. I safely assumed that x2apic is not
> > supported. Is there something to do in the bios to enable this?
> 
> Sorry, I was imprecise.  Boot the guest, it will recognize the emulated
> x2apic.
>
I booted the guest with -cpu ...,+x2apic (using libvirt), and verified
that qemu command-line does contain x2apic.

There is a log saying this:

Using CPU model
"Nehalem,+rdtscp,+x2apic,+dca,+xtpr,+tm2,+est,+vmx,+ds_cpl,+monitor,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme"
 
Though in the guest dmesg, I still do not see any x2apic logs. I am
missing something obvious here. 

Regards
Nikunj

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