.. /esxcfg-advcfg
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Adjust Performance

A command-line utility available in VMware ESXi to manage advanced configuration settings. It allows administrators to query, modify, and manage various advanced parameters that are not typically available through the standard vSphere Client or the ESXi host client interface.


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Adjust Performance

  1. Increases the number of buffers to increase VM performance over network.

    esxcfg-advcfg -s 32768 /BufferCache/MaxCapacity
    Use case
    An adversary may adjust the maximum capacity of buffer cache to increase performance of operations conducted over the network.
    Privileges required
    Administrator
    Operating systems
    ESXi < 8.0
    Tags
    E-Crime: Qilin
    Aka Agenda and is written in Golang. Uses double extortion technique and target large enterprises and high-value targets

  2. Reduces the Buffer Cache Flush interval to increase VM performance over network.

    esxcfg-advcfg -s 20000 /BufferCache/FlushInterval
    Use case
    An adversary may adjust flush interval of buffer cache to increase performance of operations conducted over the network.
    Privileges required
    Administrator
    Operating systems
    ESXi < 8.0
    Tags
    E-Crime: Qilin
    Aka Agenda and is written in Golang. Uses double extortion technique and target large enterprises and high-value targets