On 04/19/2016 12:55 AM, Shi, Yang wrote: > 2. I ran my THP test (generated a program with 4MB text section) on both > x86-64 and ARM64 with yours and Hugh's patches (linux-next tree), I got > the program execution time reduced by ~12% on x86-64, it looks very > impressive. > > But, on ARM64, there is just ~3% change, and sometimes huge tmpfs may > show even worse data than non-hugepage. > > Both yours and Hugh's patches has the same behavior. > > Any idea? Just a shot in the dark, but what page size do you use? If you use 4k pages, then hugepage size should be the same as on x86 and a similar behavior could be expected. Otherwise, hugepages would be too big to be taken advantage of by your test program. Jerome
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