The description "physical CPUs" is especially wrong, as it implies the number
of sockets, which tops out at 8 on all but the very biggest servers.
NR_CPUS is the number of logical entities the scheduler can use.
Reported-by: hanet...@startmail.com
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
---
CC: Jan Beulich <jbeul...@suse.com>
CC: Roger Pau Monné <roger....@citrix.com>
CC: Wei Liu <w...@xen.org>
CC: Stefano Stabellini <sstabell...@kernel.org>
CC: Julien Grall <jul...@xen.org>
CC: Volodymyr Babchuk <volodymyr_babc...@epam.com>
CC: hanet...@startmail.com
---
xen/arch/Kconfig | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig
index 1954d1c5c1..d144d4c8d3 100644
--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -1,11 +1,17 @@
config NR_CPUS
- int "Maximum number of physical CPUs"
+ int "Maximum number of CPUs"
range 1 4095
default "256" if X86
default "8" if ARM && RCAR3
default "4" if ARM && QEMU
default "4" if ARM && MPSOC
default "128" if ARM
- ---help---
- Specifies the maximum number of physical CPUs which Xen will support.
+ help
+ Controls the build-time size of various arrays and bitmaps
+ associated with multiple-cpu management. It is the upper bound of
+ the number of logical entities the scheduler can run code on.
+
+ For CPU cores which support Simultaneous Multi-Threading or similar
+ technologies, this the number of logical threads which Xen will
+ support.
--
2.11.0
