On Tue, Feb 15, 2005 at 11:46:21AM -0800, David Mosberger wrote: > >>>>> On Tue, 15 Feb 2005 13:31:48 -0600, Robin Holt <[EMAIL PROTECTED]> said: > > Robin> Is there a strong objection to implementing 4 levels of 16k > Robin> page tables for now and then, if someone else sees a need, > Robin> convert to using long page table format and adjust page > Robin> tables as needed at that point in time. > > I certainly don't want to switch my machines to 4-levels. There is > zero need for that on the machines I use, so why pay the overhead of > an extra level?
I missed the why the extra level question. That part is motivated by some large MPI jobs need a fourth level to get a large enough single mapping to cover their entire dataset. We have already tripped this limitation for a couple of our really large customers. Thanks, Robin - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
