Meanwhile in device driver land.. buffer queues are used to take buffers, send to devices. Could queue "infinite" writes... (Aiiee.. No Es Bueno) - I can't get buffers because they are all mapped waiting to be written. Limit write backlog in buffer queues IO's could starve with traditional elevator algorithm replace with NSCAN All of a sudden massive write bashing can't cripple the machine NSCAN and queue limiting in OpenBSD 5.3