update docs

docs/fuzzing_in_depth.md

@@ -616,7 +616,7 @@ For every secondary fuzzer there should be a variation, e.g.:
   be one of them! (Although this is not really recommended.)
 
 All other secondaries should be used like this:
-* a quarter to a third with the MOpt mutator enabled: `-L 0`
+* 10-20% with the MOpt mutator enabled: `-L 0`
 * run with a different power schedule, recommended are: `fast` (default),
   `explore`, `coe`, `lin`, `quad`, `exploit`, and `rare` which you can set with
   the `-p` option, e.g., `-p explore`. See the
@@ -940,7 +940,7 @@ too long for your overall available fuzz run time.
     * 65% for `AFL_DISABLE_TRIM`
     * 50% for `AFL_KEEP_TIMEOUTS`
     * 50% use a dictionary generated by `AFL_LLVM_DICT2FILE` + `AFL_LLVM_DICT2FILE_NO_MAIN=1`
-    * 40% use MOpt (`-L 0`)
+    * 10% use MOpt (`-L 0`)
     * 40% for `AFL_EXPAND_HAVOC_NOW`
     * 20% for old queue processing (`-Z`)
     * for CMPLOG targets, 70% for `-l 2`, 10% for `-l 3`, 20% for `-l 2AT`

src/afl-fuzz.c

@@ -176,6 +176,7 @@ static void usage(u8 *argv0, int more_help) {
       "                  pacemaker mode (minutes of no new finds). 0 = "
       "immediately,\n"
       "                  -1 = immediately and together with normal mutation.\n"
+      "                  Note: this option is usually not very effective\n"
       "  -c program    - enable CmpLog by specifying a binary compiled for "
       "it.\n"
       "                  if using QEMU/FRIDA or the fuzzing target is "