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Message-ID: <87d3bbtvnw.fsf@linux.vnet.ibm.com> Date: Mon, 26 Dec 2011 17:03:07 +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 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. 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? > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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