Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-54684

Decreased JS performance on arm64 due to mising init function

    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 4.9.0, 4.2.13, 4.4.5
    • Affects Version/s: None
    • Component/s: None
    • Labels:
      None
    • Fully Compatible
    • ALL
    • v4.4, v4.2
    • Dev Platform 2021-03-08

      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.

            Assignee:
            andrew.morrow@mongodb.com Andrew Morrow (Inactive)
            Reporter:
            tsahee@amazon.com Tsahi Zidenberg
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

              Created:
              Updated:
              Resolved: