Messages in this thread | | | Date | Mon, 9 Jan 2017 12:53:20 +0100 | From | Robert Richter <> | Subject | Re: [PATCH v3] arm64: mm: Fix NOMAP page initialization |
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On 06.01.17 08:37:25, Ard Biesheuvel wrote: > Any comments on the performance impact (including boot time) ?
I did a kernel compile test and kernel mode time increases by about 2.2%. Though this is already significant, we need a more suitable mem benchmark here for further testing.
For boot time I dont see significant changes.
-Robert
Boot times:
pfn_valid_within(): [ 25.929134] [ 25.548830] [ 25.503225]
early_pfn_valid() v3: [ 25.773814] [ 25.548428] [ 25.765290]
Kernel compile times (3 runs each):
pfn_valid_within():
real 6m4.088s user 372m57.607s sys 16m55.158s
real 6m1.532s user 372m48.453s sys 16m50.370s
real 6m4.061s user 373m18.753s sys 16m57.027s
early_pfn_valid() v3:
real 6m3.261s user 373m15.816s sys 16m30.019s
real 6m2.980s user 373m9.019s sys 16m32.992s
real 6m2.574s user 372m45.146s sys 16m33.218s
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