Messages in this thread | | | Subject | RE: Variable ticks | From | Lee Revell <> | Date | Mon, 25 Jul 2005 17:25:49 -0400 |
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On Mon, 2005-07-25 at 17:19 -0400, Brown, Len wrote: > >>>Question one, are there other actions to consider? > >> > >> > >> Yes. > >> Speaking for ACPI C3 state, note that DMA also > >> wakes up the CPU -- even if there was no device interrupt. > >> (aka, "the trouble with USB") > > > >Trouble? Why would USB do DMA unless there was a device activity? > > look here: > http://www.google.com/search?hl=en&q=usb+selective+suspend > > Linux is working on it too, but it is in development.
What about audio? If there is a sound server running then you're going to have a constant stream of interrupts and DMA activity from the sound card even if the machine is idle and there aren't any sounds playing.
Lee
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