NVF_FLUSH_DELAY
nvf_thread_id = timeout(nvf_thread, NULL, NVF_FLUSH_DELAY);
nvf_thread_ticks = ddi_get_lbolt() + NVF_FLUSH_DELAY;
NVF_FLUSH_DELAY);
if (nticks > NVF_FLUSH_DELAY) {
NVF_FLUSH_DELAY);