[rtems-libbsd commit] README: Mention SMP requirements

[Sebastian Huber]

Module:    rtems-libbsd
Branch:    6-freebsd-12
Commit:    ec8eaccc6294da8e5a80f6fd12b0df3ba11659a9
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=ec8eaccc6294da8e5a80f6fd12b0df3ba11659a9

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Tue Jun 15 18:44:50 2021 +0200

README: Mention SMP requirements

---

 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index 2ab17aa..55eac1d 100644
--- a/README.md
+++ b/README.md
@@ -221,3 +221,12 @@ configure with:
 
 The LibBSD Waf support splits the options and converts them to uppercase and
 adds them -D options on the compiler command line.
+
+SMP Requirements
+----------------
+
+In order to support
+[EPOCH(9)](https://www.freebsd.org/cgi/man.cgi?query=epoch&apropos=0&sektion=9)
+a scheduler with thread pinning support is required.  This is the case if you
+use the default scheduler configuration.  EPOCH(9) is a central synchronization
+mechanism of the network stack.