- first = (lwb->lwb_state == LWB_STATE_NEW) &&
- ((plwb = list_prev(&zilog->zl_lwb_list, lwb)) == NULL ||
- plwb->lwb_state == LWB_STATE_FLUSH_DONE);
+
+ /*
+ * If the lwb is still opened, it means the workload is really
+ * multi-threaded and we won the chance of write aggregation.
+ * If it is not opened yet, but previous lwb is still not
+ * flushed, it still means the workload is multi-threaded, but
+ * there was too much time between the commits to aggregate, so
+ * we try aggregation next times, but without too much hopes.
+ */
+ if (lwb->lwb_state == LWB_STATE_OPENED) {
+ zilog->zl_parallel = ZIL_BURSTS;
+ } else if ((plwb = list_prev(&zilog->zl_lwb_list, lwb))
+ != NULL && plwb->lwb_state != LWB_STATE_FLUSH_DONE) {
+ zilog->zl_parallel = MAX(zilog->zl_parallel,
+ ZIL_BURSTS / 2);
+ }