FLOWACCT_ITEM_SZ
length = FLOWACCT_ITEM_SZ;
item = (flow_item_t *)kmem_zalloc(FLOWACCT_ITEM_SZ, KM_NOSLEEP);
kmem_free(item, FLOWACCT_ITEM_SZ);
#define FLOWACCT_ITEM_RECORD_SZ (FLOWACCT_HDR_SZ + FLOWACCT_ITEM_SZ)