Re: [Xen-devel] [Xen-users] different number of cpus

[tutu sky <ooohooo_u@xxxxxxxxxxx>]

thanks Dario,
But do you mean i must add the line directly in "/boot/grub/grub.cfg" ? Is 
there any way to do this via a variable in "/etc/default/grub" and then do 
"update-grub" to take effect and does the corresponding changes in 
"/boot/grub/grub.cfg"?
Regards.

________________________________________
From: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Sent: Wednesday, March 30, 2016 4:27 PM
To: tutu sky; Wei Liu
Cc: Xen-devel@xxxxxxxxxxxxx
Subject: Re: [Xen-devel] [Xen-users] different number of cpus

On Tue, 2016-03-29 at 22:14 +0000, tutu sky wrote:
> menuentry 'Ubuntu GNU/Linux, with Xen hypervisor' --class ubuntu --
> class gnu-linux --class gnu --class os --class xen
> $menuentry_id_option 'xen-gnulinux-simple-d9e946b3-a4cf-4a90-8cdf-
> 689d19a2b869' {
>     insmod part_msdos
>     insmod ext2
>     set root='hd0,msdos1'
>     if [ x$feature_platform_search_hint = xy ]; then
>       search --no-floppy --fs-uuid --set=root --hint-
> bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-
> baremetal=ahci0,msdos1  d9e946b3-a4cf-4a90-8cdf-689d19a2b869
>     else
>       search --no-floppy --fs-uuid --set=root d9e946b3-a4cf-4a90-
> 8cdf-689d19a2b869
>     fi
>     echo    'Loading Xen 4 ...'
>         if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
>             xen_rm_opts=
>         else
>             xen_rm_opts="no-real-mode edd=off"
>         fi
>     multiboot    /boot/xen-4.gz placeholder loglvl=all
> guest_loglvl=all com1=115200,8n1,0x3e8,5
> console=com1,vga  ${xen_rm_opts}
>
This line here is the one.

It needs to contain dom0_max_vcpus=2.

> On Sat, Mar 12, 2016 at 10:18:15AM +0000, tutu sky wrote:
> >
> > Hi all,
> > i have installed Xen and while setting number of vcpus in Dom0 to
> > 2, then go to terminal and issue "top" command, it shows me 4 core!
> > these all happen while i have 2 cores available in
> > /sys/devices/system/cpu (just cpu0 and cpu1), so what does it mean?
> > I become totally confused, as i don't know what is the exact number
> > of cores which are assigned to Xen or Dom0.
> > in other words, when using "xl vcpu-set Domain-0 2" command, whys
> > this two vcpus are showed 4 in "top" command?
> >
> How does your xen.gz command line argument in bootloader look like?
>
Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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