arm64 + ARM64_64K_PAGES=y

[Grygorii Strashko]

Hi All,

Do anybody tried to use ARM64 RT with 76K pages enabled?

My attempt shows that enabling  CONFIG_ARM64_64K_PAGES=y increases latencies by ~30%

cyclictest -n -m -Sp98 -q -D2m with CONFIG_ARM64_64K_PAGES=y

 

T: 0 (  772) P:98 I:1000 C: 120000 Min:      7 Act:   13 Avg:   10 Max:      85
T: 1 (  773) P:98 I:1500 C:  79998 Min:      7 Act:   13 Avg:   10 Max:      71
T: 2 (  774) P:98 I:2000 C:  59997 Min:      7 Act:   11 Avg:   11 Max:      64
T: 3 (  775) P:98 I:2500 C:  47996 Min:      7 Act:   14 Avg:   12 Max:      66

 

cyclictest -n -m -Sp98 -q -D2m with CONFIG_ARM64_64K_PAGES=n

 

T: 0 (  697) P:98 I:1000 C: 120000 Min:      7 Act:   10 Avg:    9 Max:      38
T: 1 (  698) P:98 I:1500 C:  79987 Min:      7 Act:   10 Avg:   10 Max:      32
T: 2 (  699) P:98 I:2000 C:  59981 Min:      7 Act:   14 Avg:   11 Max:      46
T: 3 (  700) P:98 I:2500 C:  47977 Min:      6 Act:   11 Avg:   10 Max:      45



--
regards,
-grygorii