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    SubjectRe: [ACPI] [PATCH] i386 No Idle HZ aka dynticks v051205

    Please merge this patch also into your dyntick patchset. Upon further
    refleciton, we shouldn't be _this_ aggressive to enter C3-type sleep if
    there was bus mastering activity this jiffy.

    Signed-off-by: Dominik Brodowski <>

    Index: working-tree/drivers/acpi/processor_idle.c
    --- working-tree.orig/drivers/acpi/processor_idle.c
    +++ working-tree/drivers/acpi/processor_idle.c
    @@ -260,7 +260,7 @@ static void acpi_processor_idle(void)
    pr->power.bm_check_timestamp = jiffies;

    - * If bus mastering is active, automatically demote
    + * If bus mastering is or was active this jiffy, demote
    * to avoid a faulty transition. Note that the processor
    * won't enter a low-power state during this call (to this
    * function) but should upon the next.
    @@ -271,7 +271,8 @@ static void acpi_processor_idle(void)
    * qualification. This may, however, introduce DMA
    * issues (e.g. floppy DMA transfer overrun/underrun).
    - if (bm_status && cx-> {
    + if ((pr->power.bm_activity & 0x01) &&
    + cx-> {
    next_state = cx->demotion.state;
    if (dyn_tick_enabled())
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      Last update: 2005-12-06 07:14    [W:0.021 / U:39.324 seconds]
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