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

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Message-ID: <4EF98CB4.2050408@redhat.com>
Date:	Tue, 27 Dec 2011 11:15:32 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.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 12/27/2011 03:47 AM, Nikunj A Dadhania wrote:
> 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. 
>

Check that X2APIC is enabled in the guest .config, as well as
CONFIG_KVM_GUEST.

-- 
error compiling committee.c: too many arguments to function

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