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ARM1176JZ-S, cache confg: effective cache size calculation

deven deven
Note: This was originally posted on 22nd February 2009 at http://forums.arm.com

Hello,

1) I am using ARM1176JZ-S core with WinCE Platform. The cache memory is configured as follows

    DCache: 128 sets, 4 ways, 32 line size, 16384 size
    ICache: 128 sets, 4 ways, 32 line size, 16384 size

    Now I want to know the effective data cache size, I mean the total data from the main memory 
    could be cached and accessed without cache trashing within a function.

2) Is the cache set size(128 sets) and cache block/segment(of other processors) size are same?

Kindly reply this mail, thanks in advance

Regards,
Deven
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  • 0
    Note: This was originally posted on 12th March 2009 at http://forums.arm.com

    [skipped]
    Does the first memory access immediately after the cache flush shall consume less cycles than memory access at cache with some entry. (Assume both are cache hit condition)

    I am doing a code optimization. In any-case cache flush before the algorithm execution benefit the algorithm performance compare to with-out cache flush.


    In other way, the pseudo-random/round-robin cache line selection and fill have any effect of cache flush before the operation.


    Interesting. How big is the performance difference? Do you observe this result every time? (assuming you've made several measurements, not just one or two)...
    To be honest, I still think your profiling methods are not giving you the results you can trust.
    The "algorithm execution" you're talking about is (assuming again) a rather long loop, therefore I would not expect you to notice the effect of 'the very first memory access'...
    Let's see what isogen74 can tell about this :)
Reply
  • 0
    Note: This was originally posted on 12th March 2009 at http://forums.arm.com

    [skipped]
    Does the first memory access immediately after the cache flush shall consume less cycles than memory access at cache with some entry. (Assume both are cache hit condition)

    I am doing a code optimization. In any-case cache flush before the algorithm execution benefit the algorithm performance compare to with-out cache flush.


    In other way, the pseudo-random/round-robin cache line selection and fill have any effect of cache flush before the operation.


    Interesting. How big is the performance difference? Do you observe this result every time? (assuming you've made several measurements, not just one or two)...
    To be honest, I still think your profiling methods are not giving you the results you can trust.
    The "algorithm execution" you're talking about is (assuming again) a rather long loop, therefore I would not expect you to notice the effect of 'the very first memory access'...
    Let's see what isogen74 can tell about this :)
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