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[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>
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2 changed files with 0 additions and 28 deletions
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@ -520,16 +520,6 @@ config PCI_MMCONFIG
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bool "Support mmconfig PCI config space access"
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depends on PCI && ACPI
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config UNORDERED_IO
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bool "Unordered IO mapping access"
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depends on EXPERIMENTAL
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help
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Use unordered stores to access IO memory mappings in device drivers.
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Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
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work with this option, but it makes the drivers behave differently
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from i386. Requires that the driver writer used memory barriers
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properly.
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pci/Kconfig"
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@ -200,23 +200,6 @@ static inline __u64 __readq(const volatile void __iomem *addr)
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#define mmiowb()
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#ifdef CONFIG_UNORDERED_IO
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static inline void __writel(__u32 val, volatile void __iomem *addr)
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{
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volatile __u32 __iomem *target = addr;
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asm volatile("movnti %1,%0"
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: "=m" (*target)
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: "r" (val) : "memory");
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}
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static inline void __writeq(__u64 val, volatile void __iomem *addr)
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{
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volatile __u64 __iomem *target = addr;
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asm volatile("movnti %1,%0"
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: "=m" (*target)
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: "r" (val) : "memory");
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}
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#else
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static inline void __writel(__u32 b, volatile void __iomem *addr)
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{
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*(__force volatile __u32 *)addr = b;
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@ -225,7 +208,6 @@ static inline void __writeq(__u64 b, volatile void __iomem *addr)
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{
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*(__force volatile __u64 *)addr = b;
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}
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#endif
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static inline void __writeb(__u8 b, volatile void __iomem *addr)
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{
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*(__force volatile __u8 *)addr = b;
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