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-rw-r--r--sys/conf/NOTES3
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index 3c1ee4e7953f9..56810ce439132 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -737,6 +737,9 @@ options VFS_AIO
#
# Enabling this will probably not give an overall speedup except for
# special workloads.
+#
+# WARNING: Do not enable this, it is known to be broken, and will result
+# in system instability, as well as possible data loss.
options ENABLE_VFS_IOOPT
# Cryptographically secure random number generator; /dev/[u]random