Messages in this thread | | | Date | Wed, 18 Mar 2009 02:01:51 +0700 | Subject | Re: cli/sti vs local_cmpxchg and local_add_return | From | Andika Triwidada <> |
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Older IA-64
processor : 3 vendor : GenuineIntel arch : IA-64 family : 32 model : 0 model name : Intel(r) Itanium(r) 2 Processor 1.6GHz with 18M L3 Cache for 533MHz Platforms revision : 7 archrev : 0 features : branchlong, 16-byte atomic ops cpu number : 0 cpu regs : 4 cpu MHz : 1594.911 itc MHz : 399.226174 BogoMIPS : 3186.68 siblings : 2 physical id: 1 core id : 1 thread id : 0
test init test results: time for baseline number of loops: 20000 total time: 10003 -> baseline takes 0 cycles test end test results: time for locked cmpxchg number of loops: 20000 total time: 60073 -> locked cmpxchg takes 3 cycles test end test results: time for non locked cmpxchg number of loops: 20000 total time: 60014 -> non locked cmpxchg takes 3 cycles test end test results: time for locked add return number of loops: 20000 total time: 150007 -> locked add return takes 7 cycles test end test results: time for non locked add return number of loops: 20000 total time: 150009 -> non locked add return takes 7 cycles test end test results: time for enabling interrupts (STI) number of loops: 20000 total time: 45003 -> enabling interrupts (STI) takes 2 cycles test end test results: time for disabling interrupts (CLI) number of loops: 20000 total time: 59999 -> disabling interrupts (CLI) takes 2 cycles test end test results: time for disabling/enabling interrupts (STI/CLI) number of loops: 20000 total time: 105001 -> enabling/disabling interrupts (STI/CLI) takes 5 cycles test end
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