Ingo Molnar wrote on Monday, April 04, 2005 8:05 PM
>
> latest patch attached. Changes:
>
> - stabilized calibration even more, by using cache flushing
> instructions to generate a predictable working set. The cache
> flushing itself is not timed, it is used to create quiescent
> cache state.
>
> I only guessed the ia64 version - e.g. i didnt know what 'type'
> argument to pass to ia64_sal_cache_flush() to get a d/cache
> flush+invalidate.
It is preferable to use a ia64_pal_cache_flush instead of SAL call. But
it hangs the machine with that pal call. I will look at it tomorrow.
The type argument for sal_cache_flush is: 1 for icache, 2 for dcache,
and 3 for i+d.
> - due to more stable results, reduced ITERATIONS from 3 to 2 - this
> should further speed up calibration.
>
> tested on x86, the calibration results look ok there.
Calibration result on ia64 (1.5 GHz, 9 MB), somewhat smaller in this
version compare to earlier estimate of 10.4ms. The optimal setting
found by a db workload is around 16 ms.
---------------------
| migration cost matrix (max_cache_size: 9437184, cpu: -1 MHz):
---------------------
[00] [01] [02] [03]
[00]: - 9.3(0) 9.3(0) 9.3(0)
[01]: 9.3(0) - 9.3(0) 9.3(0)
[02]: 9.3(0) 9.3(0) - 9.3(0)
[03]: 9.3(0) 9.3(0) 9.3(0) -
--------------------------------
| cacheflush times [1]: 9.3 (9329800)
| calibration delay: 16 seconds
--------------------------------
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