On Mon, Mar 26, 2007 at 03:30:27PM +0200, Peter Zijlstra wrote: > On Mon, 2007-03-26 at 02:08 -0800, Andrew Morton wrote: > > On Mon, 26 Mar 2007 11:32:47 +0200 Miklos Szeredi <[EMAIL PROTECTED]> wrote: > > > > > Stopping writers which have idle queues is completely unproductive, > > > and that is basically what the current algorithm does. > > > > This is because the kernel permits all of its allotment of dirty+writeback > > pages to be dirty+writeback against a single device. > > > > A good way of solving the one-device-starves-another-one problem is to > > dynamically adjust the per-device dirty+writeback levels so that (for > > example) if two devices are being written to, each gets 50% of the > > allotment. > > This is exactly what happens with my patch if both devices write at the > same speed. (Or at least, that is what is supposed to happen ;-)
The testing that I did of Peter's patch showed that this cache splitting works as advertised for multiple devices writing at the same speed. (http://marc.info/?l=linux-kernel&m=117437686328396&w=2) Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
