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  1. Core Server
  2. SERVER-54684

Decreased JS performance on arm64 due to mising init function

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.9.0, 4.2.13, 4.4.5
    • None
    • None
    • Fully Compatible
    • ALL
    • v4.4, v4.2
    • Dev Platform 2021-03-08

    Description

      This bug is in mozjs(firefox) esr-60.

      The function vixl::CPU::SetUp() is never called. As a result, on arm64 MozJS will clear instruction cache separately for each byte, greatly impacting JS performance. This is especially important on Graviton2 processors, where advanced kernels expose instruction cacheline size of a full page (usually, 4KB)

      In firefox esr 68, the SetUp function is called from js::jit::InitProcessExecutableMemory.

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            andrew.morrow@mongodb.com Andrew Morrow
            tsahee@amazon.com Tsahi Zidenberg
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              Created:
              Updated:
              Resolved: