| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_linux-guest-high-cpu">
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| 4 | <title>Linux Guests May Cause a High CPU load</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Some Linux guests may cause a high CPU load even if the guest
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| 9 | system appears to be idle. This can be caused by a high timer
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| 10 | frequency of the guest kernel. Some Linux distributions, for
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| 11 | example Fedora, ship a Linux kernel configured for a timer
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| 12 | frequency of 1000Hz. We recommend to recompile the guest kernel
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| 13 | and to select a timer frequency of 100Hz.
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| 14 | </p>
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| 15 | <p>
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| 16 | Linux kernels shipped with Red Hat Enterprise Linux, as well as
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| 17 | kernels of related Linux distributions, such as CentOS and
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| 18 | Oracle Linux, support a kernel parameter
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| 19 | <i>divider=N</i>. Hence, such kernels support a
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| 20 | lower timer frequency without recompilation. We suggest you add
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| 21 | the kernel parameter <i>divider=10</i> to select a
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| 22 | guest kernel timer frequency of 100Hz.
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| 23 | </p>
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| 24 | </body>
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| 25 |
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| 26 | </topic>
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