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