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The tick rate has a frequency of HZ hertz and a period of 1/HZ seconds. For example, in include/asm-i386/param.h, the i386 architecture defines:
#define HZ 1000 /* internal kernel time frequency */
Therefore, the timer interrupt on i386 has a frequency of 1000HZ and occurs 1,000 times per second (every one-thousandth of a second, which is every millisecond). Most other architectures have a tick rate of 100. Table 10.1 is a complete listing of the supported architectures and their defined tick rates.
You can define the kernel tick rate when you build the kernel in the .config.Increasing the tick rate means the timer interrupt runs more frequently. Consequently, the work it performs occurs more often. This has the following benefits:
The timer interrupt has a higher resolution and, consequently, all timed events have a higher resolution
The accuracy of timed events improves