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