In-Reply-To: <[email protected]>
On Tue, 4 Jul 2006 08:28:57 -0700, Stephan Eranian wrote:
> Here is what I get on my dual 2.4GHz Opteron 250:
>
> booted with idle=halt
> $ pfmon --us-c -ecpu_clk_unhalted,interrupts_masked_cycles_with_interrupt_pending,interrupts_masked_cycles,cycles_no_fpu_ops_retired -k --system-wide -t 10
> <session to end in 10 seconds>
> CPU0 11,356,210 CPU_CLK_UNHALTED
> CPU0 0 INTERRUPTS_MASKED_CYCLES_WITH_INTERRUPT_PENDING
> CPU0 3,836,107 INTERRUPTS_MASKED_CYCLES
> CPU0 23,910,784,532 CYCLES_NO_FPU_OPS_RETIRED
> CPU1 19,303,632 CPU_CLK_UNHALTED
> CPU1 0 INTERRUPTS_MASKED_CYCLES_WITH_INTERRUPT_PENDING
> CPU1 13,942,265 INTERRUPTS_MASKED_CYCLES
> CPU1 23,911,872,654 CYCLES_NO_FPU_OPS_RETIRED
So it looks like your Opteron continues to count CYCLES_NO_FPU_OPS_RETIRED
at full clock speed even when halted.
My Turion appears to slow down to ~40 MHz when halted and counts those
events at that speed. Using idle=poll shows no slowdown, as expected,
and unhalted clocks equals cycles_no_fpu_ops_retired.
--
Chuck
"You can't read a newspaper if you can't read." --George W. Bush
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