* why is CONFIG_FRAME_POINTER=y so expensive?
@ 2016-08-22 6:17 Mike Galbraith
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From: Mike Galbraith @ 2016-08-22 6:17 UTC (permalink / raw)
To: LKML; +Cc: Ingo Molnar
Greetings,
tbench 8 throughput on my i4790 box:
1 2 3 avg
master 3769.95 3759.28 3762.83 3764.02 1.000
master-framepointer 3476.73 3453.52 3460.62 3463.62 .920
Does anyone know why the performance impact is this large?
The only thing I found googling was a reference to 3 arg lea using rbp
or r13 being slow, which wasn't particularly helpful. Nor was staring
at asm deltas with non-expert eyeballs.
-Mike
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2016-08-22 6:17 why is CONFIG_FRAME_POINTER=y so expensive? Mike Galbraith
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