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

[Nikunj A Dadhania]

On Mon, 26 Dec 2011 11:05:01 +0200, Avi Kivity <avi@xxxxxxxxxx> 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. 

I have enabled the following in my config;

[root@krm1 linux-tip]# grep X2APIC .config
CONFIG_X86_X2APIC=y
[root@krm1 linux-tip]#

And booted the kernel with "apic=verbose" command. 

[root@krm1 linux-tip]# dmesg | grep -i x2apic
[root@krm1 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?

> for the guest:
> 
>  qemu -cpu ...,+x2apic
> 
I need to try this, i have libvirt setup. Let me dig how to enable this
through xml file.

Regards
Nikunj

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