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

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Date:	Mon, 26 Dec 2011 13:41:04 +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 12/26/2011 01:33 PM, Nikunj A Dadhania wrote:
> On Mon, 26 Dec 2011 11:05:01 +0200, Avi Kivity <avi@...hat.com> wrote:
> > On 12/26/2011 05:14 AM, Nikunj A Dadhania wrote:
> > > > 
> > > > btw you can get an additional speedup by enabling x2apic, for
> > > > default_send_IPI_mask_logical().
> > > > 
> > > In the host?
> > >
> > 
> > In the host, 
> >
> The machine(IBM x3650 M2, Nehalem) does not seem to support x2apic. 

It's emulated.

> 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.

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

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