Why the system throws a "unknow key" error when try to set vm.nr_hugepages?

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Why the system throws a "unknow key" error when try to set vm.nr_hugepages?

 SOLUTION 已验证 - 已更新 2013年五月21日10:13 - 

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环境

Red Hat Enterprise Linux 5
kernel-xen

问题

Why the system throws a "unknow key" error when try to set vm.nr_hugepages?

决议

Hugepage is not supported on xen kernel

诊断步骤

From kernel config file:
xen kernel
# cat /boot/config-xen | grep HUGE
# CONFIG_HUGETLB_PAGE is not set

non-xen kernel
# cat /boot/config- | grep HUGE
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y