Messages in this thread |  | | | Date | Sat, 2 Apr 2005 20:04:58 -0800 | | From | Jonathan Lundell <> | | Subject | RE: x86 TSC time warp puzzle |
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At 3:13 AM -0500 4/2/05, Lee Revell wrote: >On Fri, 2005-04-01 at 23:05 -0800, Pallipadi, Venkatesh wrote: >> It can be SMI happening in the platform. Typically BIOS uses some SMI > > polling to handle some devices during early boot. Though 500 >microseconds > sounds a bit too high. > >Nope, that sounds just about right. Buggy BIOSes that implement ACPI >via SMM (or so I have been told) can stall the machine for over a >millisecond, this is why some laptops lose timer ticks at HZ=1000. The >issue is well known by Linux audio users, as it causes big problems for >people who buy laptops for live audio use.
This is a desktop board, and this is well after boot (hours). Also, ACPI is disabled in the BIOS.
I suppose I can try to disable SMI via the APIC? -- /Jonathan Lundell. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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