Re: [PATCH 207/208] x86/fpu: Add FPU performance measurement subsystem

[Dave Hansen]

On 05/05/2015 10:58 AM, Ingo Molnar wrote:
>   x86/fpu: Cost of: XSAVE                       insn          :   104 cycles
>   x86/fpu: Cost of: XRSTOR                      insn          :    80 cycles

Isn't there going to be pretty huge variability here depending on how
much state you are xsave/xrstor'ing and if the init/modified
optimizations are in play?

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