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xen-users
Re: [Xen-users] vcpus and the virtual machine manager
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@xxxxxxxxx>
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@xxxxxxxxxxxxxx>:
> 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@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
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