[PATCH] x86_64: Remove CONFIG_UNORDERED_IO

It was a failed experiment - all benchmarks done with it on both AMD
and Intel showed it was a loss. That was probably because the store
buffers of the CPUs for write combining traffic weren't large enough.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 10 deletions

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 6fc631457196..31bab721cb71 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -520,16 +520,6 @@ config PCI_MMCONFIG
         bool "Support mmconfig PCI config space access"
         depends on PCI && ACPI
 
-config UNORDERED_IO
-       bool "Unordered IO mapping access"
-       depends on EXPERIMENTAL
-       help
-         Use unordered stores to access IO memory mappings in device drivers.
-         Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
-         work with this option, but it makes the drivers behave differently
-         from i386. Requires that the driver writer used memory barriers
-         properly.
-
 source "drivers/pci/pcie/Kconfig"
 
 source "drivers/pci/Kconfig"