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  1. AR-337

Odroid XU4 Memcopy Slow on all Kernel 5.x 80MB/sec instead of 370+MB/sec

    Details

    • Type: Bug
    • Status: Done
    • Priority: High
    • Resolution: Done
    • Affects versions: None
    • Fix versions: 20.08
    • Components: Development
    • Labels:
    • Sprint:

      Description

      Kernel 4.14.186 – Fast. http://ix.io/2qxh

      Kernel 5.4 – Slow

      Kernel 5.7 – Slow http://ix.io/2qpX

      odroid forum site admin thinks DRAM controller config could have issues on kernel 5
      https://forum.odroid.com/viewtopic.php?f=184&t=38774

      Additional research…

      this patch for dynaminc timings was added around kernel 5.3 https://lwn.net/Articles/787647/

      we’re using it

      lane@billroyall:~/GIT/build$ fgrep EXYNOS5422 config/kernel/*
      config/kernel/linux-imx6-current.config:CONFIG_EXYNOS5422_DMC=m
      config/kernel/linux-odroidxu4-current.config:CONFIG_EXYNOS5422_DMC=y
      config/kernel/linux-odroidxu4-dev.config:CONFIG_EXYNOS5422_DMC=y

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              • Assignee:
                Lane Jennison
                Reporter:
                Lane Jennison
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                • Created:
                  Updated:
                  Resolved: