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    SubjectRe: Lost Ticks on x86_64
    On Sun, Aug 07, 2005 at 01:36:01PM +0200, Andi Kleen wrote:
    > Erick Turnquist <jhujhiti@gmail.com> writes:
    >
    > > Hi, I'm running an Athlon64 X2 4400+ (a dual core model) with an
    > > nVidia GeForce 6800 Ultra on a Gigabyte GA-K8NXP-SLI motherboard and
    > > getting nasty messages like these in my dmesg:
    > >
    > > warning: many lost ticks.
    > > Your time source seems to be instable or some driver is hogging interupts
    > > rip default_idle+0x20/0x30
    >
    > It's most likely bad SMM code in the BIOS that blocks the CPU too long
    > and is triggered in idle. You can verify that by using idle=poll
    > (not recommended for production, just for testing) and see if it goes away.
    >
    > No way to fix this, but you can work around it with very new kernels
    > by compiling with a lower HZ than 1000.

    Some BIOSes do not lock SMM, and you *could* turn it off at the chipset
    level.
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