On Monday, November 22, 2010 1:37:45 pm Alan Cox wrote: > On Mon, Nov 22, 2010 at 6:59 AM, John Baldwin <j...@freebsd.org> wrote: > > > On Sunday, November 21, 2010 8:05:26 pm Sean Bruno wrote: > > > Looks like these HP boxes have the capability to do 44 bit memory > > > addressing if configured to do so from the BIOS. > > > > > > Is anyone interested in any data from that setting? > > > > Does it boot ok? :) The MTRR code should handle that (there is a CPUID > > field that tells the OS how many bits are significant). Not sure if there > > are any places in the pmap that assume 40 bits, but a test boot is > > certainly > > worth trying. > > > > > Since we don't boot with 40-bit addressing, I can easily predict the > outcome. :-) > > The trouble with this machine is that the second 128GB of RAM is being > placed between 512G and 1T in the physical address space, which is beyond > the range of the (current) direct map. So, we take a page fault on the > first access to a page in the second 128GB through the direct map.
Heh, I guess that is what your earlier patch did? Once that patch is applied I think Sean should just try 44-bit mode if so. -- John Baldwin _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
