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    Subject[PATCH] HZ: 300Hz support
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    Fix two things. Firstly the unit is "Hz" not "HZ". Secondly it is useful
    to have 300Hz support when doing multimedia work. 250 is fine for us in
    Europe but the US frame rate is 30fps (29.99 blah for pedants). 300
    gives us a tick divisible by both 25 and 30, and for interlace work 50
    and 60. It's also giving similar performance to 250Hz.

    I'd argue we should remove 250 and add 300, but that might be excess
    disruption for now.

    Signed-off-by: Alan Cox <alan@redhat.com>

    diff -u --new-file --recursive --exclude-from /usr/src/exclude
    linux.vanilla-2.6.19-rc4-mm1/kernel/Kconfig.hz
    linux-2.6.19-rc4-mm1/kernel/Kconfig.hz
    --- linux.vanilla-2.6.19-rc4-mm1/kernel/Kconfig.hz 2006-10-31
    15:40:54.000000000 +0000
    +++ linux-2.6.19-rc4-mm1/kernel/Kconfig.hz 2006-11-08 17:06:38.000000000
    +0000
    @@ -7,7 +7,7 @@
    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
    + 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.
    @@ -19,21 +19,30 @@
    config HZ_100
    bool "100 HZ"
    help
    - 100 HZ is a typical choice for servers, SMP and NUMA systems
    + 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
    + 250 Hz is a good compromise choice allowing server performance
    while also showing good interactive responsiveness even
    - on SMP and NUMA systems.
    + 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
    + 1000 Hz is the preferred choice for desktop systems and other
    systems requiring fast interactive responses to events.

    endchoice
    @@ -42,5 +51,6 @@
    int
    default 100 if HZ_100
    default 250 if HZ_250
    + default 300 if HZ_300
    default 1000 if HZ_1000



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