From: Lee Revell <rlrevell@joe-job.com>
To: "Brown, Len" <len.brown@intel.com>
Cc: Bill Davidsen <davidsen@tmr.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: RE: Variable ticks
Date: Mon, 25 Jul 2005 17:25:49 -0400 [thread overview]
Message-ID: <1122326750.1472.46.camel@mindpipe> (raw)
In-Reply-To: <F7DC2337C7631D4386A2DF6E8FB22B300424AC59@hdsmsx401.amr.corp.intel.com>
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
next prev parent reply other threads:[~2005-07-25 21:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-25 21:19 Variable ticks Brown, Len
2005-07-25 21:25 ` Lee Revell [this message]
2005-07-27 8:13 ` Zwane Mwaikambo
2005-07-27 20:43 ` Lee Revell
2005-07-27 21:06 ` Valdis.Kletnieks
2005-07-27 22:03 ` Zwane Mwaikambo
2005-07-26 15:50 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2005-07-26 16:08 Brown, Len
2005-07-25 19:10 Brown, Len
2005-07-25 21:05 ` Bill Davidsen
2005-07-25 18:59 Bill Davidsen
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