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Date: Wed, 3 Sep 2008 21:01:35 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Andreas Mohr <andi@...as.de> cc: Venki Pallipadi <venkatesh.pallipadi@...el.com>, linux-kernel@...r.kernel.org, shaohua.li@...el.com Subject: Re: [PATCH] Prevent clockevent event_handler ending up handler_noop On Wed, 3 Sep 2008, Andreas Mohr wrote: > On Wed, Sep 03, 2008 at 07:15:16PM +0200, Thomas Gleixner wrote: > > On Wed, 3 Sep 2008, Andreas Mohr wrote: > > > See what such highres-deprived people as myself (PIT, acpi_pm, > > > _no_ HPET and thus no IRQed highres timer) are doing now, > > > > Err. PIT + acpi_pm works with highres. acpi_pm is a stable clocksource > > and PIT is not a good, but a usable oneshot timer. > > Hmm. What I'm interested in is longer wakeup timeouts (ACPI C2/C3 > stuff), which would be a problem with PIT (~20 forced wakeups per second) > but with my new timer that would work. > Oh, side question: it _is_ easily possible to then disable PIT IRQs > once my event device is registered, right? Otherwise I could forget > about power management benefits... When you register something better than PIT, then the PIT is disabled completely. No more interrupts from there. > So as I see it, the most beneficial thing I can do is to provide > a clock_event_device only. Right. > Out of interest: how big would you believe the benefit to be? > (overall system performance gains and ACPI PM benefits) Hard to tell, your milage can vary. tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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