> Date: Wed, 4 Nov 2020 22:38:13 +0100
> From: Klemens Nanni <k...@openbsd.org>
>
> On Wed, Nov 04, 2020 at 09:46:39PM +0100, Mark Kettenis wrote:
> > stride is not a factor, so your description makes no sense to me.
> ldomctl/config.c uses it as factor:
>
> SIMPLEQ_FOREACH(domain, &conf.domain_list, entry) {
> if (strcmp(domain->name, "primary") == 0) {
> primary_num_cpus = domain->vcpu;
> primary_stride = domain->vcpu_stride;
> primary_memory = domain->memory;
> }
> num_cpus += (domain->vcpu * domain->vcpu_stride);
> memory += domain->memory;
> }
>
> > a stride of 4 means we allocate VCPUs 4-at-a-time but only assign 1 of
> > those to the domain. It is a step size.
> Let's reword, is that any better?
Yeah, that reads better. On request though. Can you pick a character
name from:
https://www.openbsd.org/lyrics.html#38
as the name of the domain? Beluge is the bad guy, so this probably
should be Marlus.
> Index: ldom.conf.5
> ===================================================================
> RCS file: /cvs/src/usr.sbin/ldomctl/ldom.conf.5,v
> retrieving revision 1.14
> diff -u -p -r1.14 ldom.conf.5
> --- ldom.conf.5 14 Sep 2020 19:42:16 -0000 1.14
> +++ ldom.conf.5 4 Nov 2020 21:37:20 -0000
> @@ -38,8 +38,11 @@ If no configuration for the primary doma
> all CPU and memory resources not used by any guest domains.
> .It Ic vcpu Ar number Ns Op : Ns Ar stride
> Declare the number of virtual CPUs assigned to a domain.
> -Optionally a stride can be specified to allocate additional virtual CPUs
> -but not assign them to a domain.
> +Optionally a stride can be specified to allocate
> +.Ar stride
> +VCPUs at a time but assign only
> +.Ar number
> +VCPUs to the domain.
> This can be used to distribute virtual CPUs over the available CPU cores.
> .It Ic memory Ar bytes
> Declare the amount of memory assigned to a domain, in bytes.
> @@ -117,6 +120,20 @@ domain "salmah" {
> .Pp
> On a machine with 32 cores and 64GB physical memory, this leaves 12 cores and
> 58GB memory to the primary domain.
> +.Pp
> +Use a
> +.Ar stride
> +step size to distribute VCPUs:
> +.Bd -literal -offset indent
> +domain "sun" {
> + vcpu 2:4
> + memory 4G
> + vdisk "/home/sun/vdisk0"
> +}
> +.Ed
> +On a machine with eight threads per physical core, this allocates two strides
> +of four VCPUs each for the guest domain but assigns only two VCPUs to it,
> i.e.
> +make it occupy an entire physical core while running on two threads only.
> .Sh SEE ALSO
> .Xr eeprom 8 ,
> .Xr ldomctl 8 ,
>
