RFC: Page size on PPC/PPC64 builders

Dave Jones davej at redhat.com
Mon Mar 3 03:36:58 UTC 2008


On Sun, Mar 02, 2008 at 08:33:44PM +0000, David Woodhouse wrote:
 > 
 > On Sun, 2008-03-02 at 20:18 +0100, Lubomir Kundrak wrote:
 > > I never knew this is possible in x86_64 :)
 > > Is there a strong reason against 64k pages there? :)
 > 
 > While it's OK for x86_64 programs, I believe it's not compatible with
 > the i386 ABI. So you wouldn't be able to run 32-bit programs on such a
 > kernel.

The larger problem would be that the x86-64 doesn't support 64K page size
in hardware, and the kernel currently doesn't offer an option to emulate
such through softpages.  People have looked at doing so in the past,
but from what I recall, performance took a nosedive on everything but
a few db benchmarks.

	Dave

-- 
http://www.codemonkey.org.uk




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