On Fri, Jun 19, 2009 at 03:59:57PM +0200, Jes Sorensen wrote:
> Hi,
>
> This one introduces a -maxcpus setting, allowing the user to specify
> the maximum number of vCPUs the system can have, as discussed with Gleb
> earlier in the week.
What is the maximum value for the 'maxcpus' setting for KVM ?
libvirt currently does
fd = open("/dev/kvm")
r = ioctl(fd, KVM_CHECK_EXTENSION, KVM_CAP_NR_VCPUS);
to figure out what the maximum allowed vCPUs will be for KVM,
and currently it is returning 16 IIRC.
> @@ -5666,6 +5667,13 @@ int main(int argc, char **argv, char **e
> exit(1);
> }
> break;
> + case QEMU_OPTION_maxcpus:
> + max_cpus = atoi(optarg);
> + if ((max_cpus < 1) || (max_cpus > machine->max_cpus)) {
> + fprintf(stderr, "Invalid number of CPUs\n");
> + exit(1);
> + }
> + break;
> case QEMU_OPTION_vnc:
> display_type = DT_VNC;
> vnc_display = optarg;
This implies the limit (for x86 pc machine at least) is now 255. Is that
the correct interpretation on my part ?
Regards,
Daniel
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