xbuf_tq
ASSERT(xbuf_tq == NULL);
xbuf_tq = taskq_create("xbuf_taskq", ncpus,
xap->xa_tq = xbuf_tq;
ASSERT((xbuf_refcount != 0) && (xbuf_tq != NULL));
taskq_destroy(xbuf_tq);
xbuf_tq = NULL;
static taskq_t *xbuf_tq = NULL;