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[PATCH] x86_64: On Intel CPUs don't do an additional CPU sync before RDTSC
authorAndi Kleen <ak@suse.de>
Wed, 11 Jan 2006 21:45:24 +0000 (22:45 +0100)
committerLinus Torvalds <torvalds@g5.osdl.org>
Thu, 12 Jan 2006 03:04:58 +0000 (19:04 -0800)
commitc818a18146997d1356a4840b0c01f1168c16c8a4
tree8d7e049742e87666bf3089fe46e04828b6417fd7tree | snapshot
parent7f6c5b046978d68e69bdc73433ead41612a2a1c9commit | diff
[PATCH] x86_64: On Intel CPUs don't do an additional CPU sync before RDTSC

RDTSC serialization using cpuid is not needed for Intel platforms.
This increases gettimeofday performance.

Cc: vojtech@suse.cz
Cc: rohit.seth@intel.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
arch/x86_64/kernel/setup.c diff | blob | history
arch/x86_64/kernel/time.c diff | blob | history
arch/x86_64/kernel/vsyscall.c diff | blob | history
include/asm-x86_64/cpufeature.h diff | blob | history
include/asm-x86_64/timex.h diff | blob | history
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