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I've edited /boot/grub/grub.conf and added nohz=off to the command line of the default kernel.

I do not see any difference, kernel is compiled with 1000Hz, but when I test with the following tool: http://www.advenage.com/topics/linux-timer-interrupt-frequency.php

It reports only about 500Hz interrupt frequency.

dmesg | grep nohz only shows the kernel boot command.

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