Hi List, with vcpus=4 I can choose the number of cpus My virtual machine manager GUI shows: Maximum allocation: 2 Host CPUs: 8 How do I increase the Maximum allocations? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi List, with vcpus=4 I can choose the number of cpus. My virtual machine manager GUI shows: Maximum allocation: 2 Host CPUs: 8 How do I increase the maximum allocations? Best, Mike _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Mike, "vcpus" option set the virtual cpus, not the physical cpus to use. If your server have 8 cpus, they are numbered from 0 to 7. If you want to assign the last 4 physical cpus, you must add to the DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning using "xm vcpu-list" in command line. Is very good practice to manage the cpu assigning, it increases the performance of VMs, and avoid problems when sharing cpus, like freezing because of I/O events. Regards, Diego 2011/8/25 Mike Sievers <saturngeist@googlemail.com>:> Hi List, > > with vcpus=4 I can choose the number of cpus. > > My virtual machine manager GUI shows: > Maximum allocation: 2 > Host CPUs: 8 > > How do I increase the maximum allocations? > > Best, > Mike > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Diego, I wrote in my config: vcpus=4 and I thought that the domU has the performance of 4 cpus. 1nd) xm vcpu-list | grep vm7 vm7 35 0 5 -b- 235.8 1,3,5,7 vm7 35 1 5 -b- 167.9 1,3,5,7 vm7 35 2 7 -b- 88.1 1,3,5,7 vm7 35 3 5 -b- 92.7 1,3,5,7 2nd) with cpus="4-7" xm vcpu-list | grep vm7 vm7 36 0 4 -b- 8.6 4-7 More performance with the 2nd version? Best, Mike 2011/8/25 Diego Dave <diego.dave.s@gmail.com>> Hi Mike, > > "vcpus" option set the virtual cpus, not the physical cpus to use. > > If your server have 8 cpus, they are numbered from 0 to 7. > > If you want to assign the last 4 physical cpus, you must add to the > DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning > using "xm vcpu-list" in command line. > > Is very good practice to manage the cpu assigning, it increases the > performance of VMs, and avoid problems when sharing cpus, like > freezing because of I/O events. > > Regards, > > Diego > > 2011/8/25 Mike Sievers <saturngeist@googlemail.com>: > > Hi List, > > > > with vcpus=4 I can choose the number of cpus. > > > > My virtual machine manager GUI shows: > > Maximum allocation: 2 > > Host CPUs: 8 > > > > How do I increase the maximum allocations? > > > > Best, > > Mike > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Mike,
The vcpus option should be together the cpus option, to assign each
vcpu to each phy cpu.
See one of my cfg files:
---------------------------------------------------------------------------------------------------------------------------------------------------------------
import os, re
arch = os.uname()[4]
if re.search(''64'', arch):
arch_libdir = ''lib64''
else:
arch_libdir = ''lib''
kernel = "/usr/lib/xen-default/boot/hvmloader"
builder=''hvm''
memory = 8192
cpus = ''6-7''
vcpus = 2
shadow_memory = 8
name = "correo"
pci = [ ''02:00.0'', ''02:00.1'' ]
disk = [ ''file:/home/correo.img,hda,w'' ]
boot="dc"
vnc = 1
#vncunused=0
sdl = 0
vncconsole=1
vncdisplay=0
#vnclisten=''0.0.0.0''
acpi = 1
apic = 1
device_model = ''/usr/'' + arch_libdir +
''/xen-default/bin/qemu-dm''
stdvga=0
serial=''pty''
usbdevice=''tablet''
on_poweroff = ''destroy''
on_reboot = ''restart''
on_crash = ''restart''
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Regards,
Diego
2011/8/26 Mike Sievers
<saturngeist@googlemail.com>:> Hi Diego,
>
> I wrote in my config: vcpus=4
> and I thought that the domU has the performance of 4 cpus.
>
> 1nd)
> xm vcpu-list | grep vm7
> vm7 35 0 5 -b- 235.8 1,3,5,7
> vm7 35 1 5 -b- 167.9 1,3,5,7
> vm7 35 2 7 -b- 88.1 1,3,5,7
> vm7 35 3 5 -b- 92.7 1,3,5,7
>
> 2nd)
> with cpus="4-7"
>
> xm vcpu-list | grep vm7
> vm7 36 0 4 -b- 8.6 4-7
>
> More performance with the 2nd version?
>
> Best,
> Mike
>
> 2011/8/25 Diego Dave <diego.dave.s@gmail.com>
>>
>> Hi Mike,
>>
>> "vcpus" option set the virtual cpus, not the physical cpus to
use.
>>
>> If your server have 8 cpus, they are numbered from 0 to 7.
>>
>> If you want to assign the last 4 physical cpus, you must add to the
>> DomU cfg file the option "cpus = ''4-7''. Then you
can see the assigning
>> using "xm vcpu-list" in command line.
>>
>> Is very good practice to manage the cpu assigning, it increases the
>> performance of VMs, and avoid problems when sharing cpus, like
>> freezing because of I/O events.
>>
>> Regards,
>>
>> Diego
>>
>> 2011/8/25 Mike Sievers <saturngeist@googlemail.com>:
>> > Hi List,
>> >
>> > with vcpus=4 I can choose the number of cpus.
>> >
>> > My virtual machine manager GUI shows:
>> > Maximum allocation: 2
>> > Host CPUs: 8
>> >
>> > How do I increase the maximum allocations?
>> >
>> > Best,
>> > Mike
>> >
>> > _______________________________________________
>> > Xen-users mailing list
>> > Xen-users@lists.xensource.com
>> > http://lists.xensource.com/xen-users
>> >
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users
OK, thanks. 2011/8/26 Diego Dave <diego.dave.s@gmail.com>> Hi Mike, > > The vcpus option should be together the cpus option, to assign each > vcpu to each phy cpu. > > See one of my cfg files: > > > --------------------------------------------------------------------------------------------------------------------------------------------------------------- > import os, re > arch = os.uname()[4] > if re.search(''64'', arch): > arch_libdir = ''lib64'' > else: > arch_libdir = ''lib'' > > kernel = "/usr/lib/xen-default/boot/hvmloader" > > builder=''hvm'' > > memory = 8192 > > cpus = ''6-7'' > > vcpus = 2 > > shadow_memory = 8 > > name = "correo" > > pci = [ ''02:00.0'', ''02:00.1'' ] > > disk = [ ''file:/home/correo.img,hda,w'' ] > > boot="dc" > > vnc = 1 > #vncunused=0 > sdl = 0 > vncconsole=1 > vncdisplay=0 > #vnclisten=''0.0.0.0'' > acpi = 1 > apic = 1 > device_model = ''/usr/'' + arch_libdir + ''/xen-default/bin/qemu-dm'' > stdvga=0 > serial=''pty'' > > usbdevice=''tablet'' > > on_poweroff = ''destroy'' > on_reboot = ''restart'' > on_crash = ''restart'' > > --------------------------------------------------------------------------------------------------------------------------------------------------------------- > > Regards, > > Diego > > > 2011/8/26 Mike Sievers <saturngeist@googlemail.com>: > > Hi Diego, > > > > I wrote in my config: vcpus=4 > > and I thought that the domU has the performance of 4 cpus. > > > > 1nd) > > xm vcpu-list | grep vm7 > > vm7 35 0 5 -b- 235.8 1,3,5,7 > > vm7 35 1 5 -b- 167.9 1,3,5,7 > > vm7 35 2 7 -b- 88.1 1,3,5,7 > > vm7 35 3 5 -b- 92.7 1,3,5,7 > > > > 2nd) > > with cpus="4-7" > > > > xm vcpu-list | grep vm7 > > vm7 36 0 4 -b- 8.6 4-7 > > > > More performance with the 2nd version? > > > > Best, > > Mike > > > > 2011/8/25 Diego Dave <diego.dave.s@gmail.com> > >> > >> Hi Mike, > >> > >> "vcpus" option set the virtual cpus, not the physical cpus to use. > >> > >> If your server have 8 cpus, they are numbered from 0 to 7. > >> > >> If you want to assign the last 4 physical cpus, you must add to the > >> DomU cfg file the option "cpus = ''4-7''. Then you can see the assigning > >> using "xm vcpu-list" in command line. > >> > >> Is very good practice to manage the cpu assigning, it increases the > >> performance of VMs, and avoid problems when sharing cpus, like > >> freezing because of I/O events. > >> > >> Regards, > >> > >> Diego > >> > >> 2011/8/25 Mike Sievers <saturngeist@googlemail.com>: > >> > Hi List, > >> > > >> > with vcpus=4 I can choose the number of cpus. > >> > > >> > My virtual machine manager GUI shows: > >> > Maximum allocation: 2 > >> > Host CPUs: 8 > >> > > >> > How do I increase the maximum allocations? > >> > > >> > Best, > >> > Mike > >> > > >> > _______________________________________________ > >> > Xen-users mailing list > >> > Xen-users@lists.xensource.com > >> > http://lists.xensource.com/xen-users > >> > > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users