smiklosovic commented on code in PR #3696:
URL: https://github.com/apache/cassandra/pull/3696#discussion_r2027251296


##########
NEWS.txt:
##########
@@ -71,6 +71,24 @@ using the provided 'sstableupgrade' tool.
 
 New features
 ------------
+    - JDK21 and Generational ZGC is now officially supported. By default, when 
JDK21 is used the server params in
+      jvm21-server.options will be used. We do not recommend using 
non-generational ZGC with Apache Cassandra. The following
+      options are seeded in jvm21-server.options and can be set by the user 
based on use-case:
+        # Temporary workaround for jamm's incorrect default CompressedOops; if 
you're using ZGC this needs to be set
+        -XX:-UseCompressedOops
+        # Blanket enabling of all the THP / large pages available in the env
+        # -XX:+UseLargePages
+        # Max size ZGC will _attempt_ to stay below
+        # -XX:+SoftMaxHeapSize=12G
+        # Don't let ZGC return unclaimed memory to the OS by setting min and 
max ==
+        # -Xms12G </string>

Review Comment:
   what are these `</string>` about? below as well



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