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| author |   kn <kn@openbsd.org> | 2020-11-06 21:32:09 +0000 |
|---|---|---|
| committer | kn <kn@openbsd.org> | 2020-11-06 21:32:09 +0000 |
| commit | a8f2388333c04d1fb0cb2d7f0307f79f401b22c1 (patch) | |
| tree | cfe7929a17f943a3b30b0cb3d9a9b0d5f905fd09 | |
| parent | Keep track of allowed ips pointer correctly (diff) | |
| download | wireguard-openbsd-a8f2388333c04d1fb0cb2d7f0307f79f401b22c1.tar.xz wireguard-openbsd-a8f2388333c04d1fb0cb2d7f0307f79f401b22c1.zip | |
Explain vcpu strides, provide example
Quite a few users and developers (including me) were confused by how
virtual CPU strides would work.
Initial diff together with stsp, final feedback from kettenis
| -rw-r--r-- | usr.sbin/ldomctl/ldom.conf.5 | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/usr.sbin/ldomctl/ldom.conf.5 b/usr.sbin/ldomctl/ldom.conf.5 index 3be148d3ed3..5a6f0aef9af 100644 --- a/usr.sbin/ldomctl/ldom.conf.5 +++ b/usr.sbin/ldomctl/ldom.conf.5 @@ -1,4 +1,4 @@ -.\" $OpenBSD: ldom.conf.5,v 1.14 2020/09/14 19:42:16 kn Exp $ +.\" $OpenBSD: ldom.conf.5,v 1.15 2020/11/06 21:32:09 kn Exp $ .\" .\" Copyright (c) 2012 Mark Kettenis <kettenis@openbsd.org> .\" @@ -14,7 +14,7 @@ .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" -.Dd $Mdocdate: September 14 2020 $ +.Dd $Mdocdate: November 6 2020 $ .Dt LDOM.CONF 5 sparc64 .Os .Sh NAME @@ -38,8 +38,11 @@ If no configuration for the primary domain exists it is assigned 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 +120,21 @@ 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 "marlus" { + vcpu 2:4 + memory 4G + vdisk "/home/marlus/vdisk0" +} +.Ed +.Pp +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.\& +makes it occupy an entire physical core while running on two threads only. .Sh SEE ALSO .Xr eeprom 8 , .Xr ldomctl 8 , |