Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#
# Timer Interrupt Frequency Configuration
#

choice
        prompt "Timer frequency"
        default HZ_250
        help
         Allows the configuration of the timer frequency. It is customary
         to have the timer interrupt run at 1000 Hz but 100 Hz may be more
         beneficial for servers and NUMA systems that do not need to have
         a fast response for user interaction and that may experience bus
         contention and cacheline bounces as a result of timer interrupts.
         Note that the timer interrupt occurs on each processor in an SMP
         environment leading to NR_CPUS * HZ number of timer interrupts
         per second.


        config HZ_100
                bool "100 HZ"
        help
          100 Hz is a typical choice for servers, SMP and NUMA systems
          with lots of processors that may show reduced performance if
          too many timer interrupts are occurring.

        config HZ_250
                bool "250 HZ"
        help
         250 Hz is a good compromise choice allowing server performance
         while also showing good interactive responsiveness even
         on SMP and NUMA systems. If you are going to be using NTSC video
         or multimedia, selected 300Hz instead.

        config HZ_300
                bool "300 HZ"
        help
         300 Hz is a good compromise choice allowing server performance
         while also showing good interactive responsiveness even
         on SMP and NUMA systems and exactly dividing by both PAL and
         NTSC frame rates for video and multimedia work.

        config HZ_1000
                bool "1000 HZ"
        help
         1000 Hz is the preferred choice for desktop systems and other
         systems requiring fast interactive responses to events.

endchoice

config HZ
        int
        default 100 if HZ_100
        default 250 if HZ_250
        default 300 if HZ_300
        default 1000 if HZ_1000