Messages in this thread | | | Date | Sat, 9 Jun 2007 12:49:26 -0400 | From | Disconnect <> | Subject | Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21 |
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On 6/9/07, Mikael Pettersson <mikpe@it.uu.se> wrote: > According to your system description it seems that you have a > Targa Visionary laptop with a VIA chipset and a Mobile Athlon64. > If so, then you probably have the same problem I reported some time > ago: see <http://marc.info/?l=linux-kernel&m=117681226421346&w=2> > and the followup messages. The conclusion was that the chipset's > ACPI PM timer slows down when the CPU is in C2. > > The workaround is to boot with processor.max_cstate=1. >
I was seeing the same problem on a Ferrari 3200 (with ubuntu kernels) but more recent kernels (2.6.21.3-ck2-swsusp2) don't ever seem to enter C2 at all - according to powertop (1.5) its always in C0. (And yes, this solved the clock problem at the cost of power use.)
I can provide any additional details that might help, and I'm in a decent position to test things right now.
processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 12 model name : Mobile AMD Athlon 64 Processor 2800+ stepping : 0 cpu MHz : 800.000 cache size : 512 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow bogomips : 1605.13 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp - 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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