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| author | Yuri Pankov <yuripv@FreeBSD.org> | 2023-10-12 19:49:47 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2023-10-24 19:26:57 +0000 |
| commit | 2d3d2475c99f0be30ec4bb15eae5a435039c742e (patch) | |
| tree | ef5f6a2dd662213e34eec39836241522e36e8f90 | |
| parent | e40945c35f5c1a5b67cd70a1ffe007eeea6a2085 (diff) | |
| download | src-2d3d2475c99f0be30ec4bb15eae5a435039c742e.tar.gz src-2d3d2475c99f0be30ec4bb15eae5a435039c742e.zip | |
bhyve: Document the hw.vmm.maxcpu tunable and the current limit on vCPUs
Reviewed by: corvink (original version)
Co-authored-by: John Baldwin <jhb@FreeBSD.org>
Differential Revision: https://reviews.freebsd.org/D40074
(cherry picked from commit da202b0fe616e9314739f01493ae310e37a36d8d)
(cherry picked from commit cfdb5e70adb3614f70a35240eab89519a5536d2c)
Approved by: re (gjb)
| -rw-r--r-- | share/man/man4/vmm.4 | 12 | ||||
| -rw-r--r-- | usr.sbin/bhyve/bhyve.8 | 12 |
2 files changed, 21 insertions, 3 deletions
diff --git a/share/man/man4/vmm.4 b/share/man/man4/vmm.4 index e94f0ccaeac8..cb3276a7d8f1 100644 --- a/share/man/man4/vmm.4 +++ b/share/man/man4/vmm.4 @@ -22,7 +22,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd December 19, 2013 +.Dd October 12, 2023 .Dt VMM 4 .Os .Sh NAME @@ -79,6 +79,16 @@ The and .Va pptdevs3 variables can be used for additional entries. +.Sh LOADER TUNABLES +Tunables can be set at the +.Xr loader 8 +prompt before booting the kernel or stored in +.Xr loader.conf 5 . +.Bl -tag -width indent +.It Va hw.vmm.maxcpu +Maximum number of virtual CPUs. +The default is the number of physical CPUs in the system. +.El .Sh EXAMPLES Reserve three PCI devices for use by the hypervisor: bus 10 slot 0 function 0, bus 6 slot 5 function 0, and bus 6 slot 5 function 1. diff --git a/usr.sbin/bhyve/bhyve.8 b/usr.sbin/bhyve/bhyve.8 index 7eddeec4647a..21313e0fcad4 100644 --- a/usr.sbin/bhyve/bhyve.8 +++ b/usr.sbin/bhyve/bhyve.8 @@ -22,7 +22,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd May 5, 2023 +.Dd October 12, 2023 .Dt BHYVE 8 .Os .Sh NAME @@ -131,7 +131,6 @@ The default value for each of and .Ar threads is 1. -The current maximum number of guest virtual CPUs is 16. If .Ar numcpus is not specified then it will be calculated from the other arguments. @@ -145,6 +144,15 @@ and If a .Ar setting is specified more than once the last one has precedence. +.Pp +The maximum number of virtual CPUs defaults to the number of active +physical CPUs in the system available via the +.Va hw.vmm.maxcpu +.Xr sysctl 8 +variable. +The limit can be adjusted via the +.Va hw.vmm.maxcpu +loader tunable. .It Fl D Destroy the VM on guest initiated power-off. .It Fl e |