Messages in this thread | | | Date | Thu, 6 Jul 2006 13:30:14 -0400 | From | Chuck Ebbert <> | Subject | Re: [PATCH 10/17] 2.6.17.1 perfmon2 patch for review: PMU context switch |
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In-Reply-To: <20060704152857.GA6999@frankl.hpl.hp.com>
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 - 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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