linux-kernel - arm64 + ARM64_64K

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Date:   Tue, 6 Nov 2018 15:34:55 -0600
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     <linux-rt-users@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: arm64 + ARM64_64K_PAGES=y

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