There is an off-by-one error in sched_slept().
With that patched, my box seems to work.

best regards
Matthias


@@ -470,7 +457,7 @@ sched_slept(struct lwp *l)
         * If thread is in time-sharing queue and batch flag is not marked,
         * increase the the priority, and run with the lower time-quantum.
         */
-       if (l->l_priority <= PRI_HIGHEST_TS &&
+       if (l->l_priority < PRI_HIGHEST_TS &&
            (sil->sl_flags & SL_BATCH) == 0) {
                KASSERT(l->l_class == SCHED_OTHER);
                l->l_priority++;




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