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New SAM460EX
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  • Andreas_Wolf
    # 744
  • Yokemate of Keyboards
    Yokemate of Keyboards
    Andreas_Wolf
    Posts: 12407 from 2003/5/22
    From: Germany
    Update:

    >>> Just for the purpose of overview I compiled a list of the DMIPS/MHz per core
    >>> figures for various PPCs in ascending order (AltiVec capability is generally
    >>> ignored, obviously):
    >>> [...]
    >>> e5500: 3.0

    >> The table on page #2 of the QorIQ AMP fact sheet PDF indicates that
    >> the e6500 core didn't improve in that regard (comparing e6500's per-thread
    >> performance to e5500's per-core performance).

    > The QorIQ AMP T4240/T4160 fact sheet claims "6.0 DMIPS/MHz per core"
    > and at the same time for dual threads "1.7 times the performance of a single thread".
    > To me this sounds strange as I think it should be [...] about 5 DMIPS per MHz and core
    > at best in case of dual-threaded execution.

    According to page 11 of

    http://www.freescale.com/files/training_pdf/FTF/2012/americas/WBNR_FTF12_NET_F0027.pdf
    http://www.freescale.co.jp/event/ftfj/2012/technicalsession/pdf/FTF12_NET_F0027_Don_rev2-180.pdf
    http://www.freescale.com/files/training/doc/dwf/DWF13_AMF_NET_T0027_Ottawa.pdf
    http://www.power.org/wp-content/uploads/2013/11/QorIQ-T4xxx-Slides.pdf

    it's indeed 6.0 (or 5.4, or 7?) DMIPS/MHz per e6500 core, but 3.3 instead of 3.0 (or 2.7?) DMIPS/MHz per thread, which amounts to a factor of 1.8 (or 1.6, or 2.1?) instead of 1.7.
    Taking these new information into account, this is the revised list of the DMIPS/MHz per core figures for various PPCs:

    e300: 1.9...2.0 (depending on version)
    PPC440: 2.0
    PPC460: 2.0
    PA6T: 2.2
    PPC750: 2.3
    e600: 2.3
    e500mc: 2.5 (or 2.7?)
    PPC470: 2.7
    PPC970: 2.9
    e5500: 3.0 (or 3.3 (32-bit) and 3.4 (64-bit)?)
    e6500 (1 thread): 3.3 (or 3.4 (32-bit) and 3.5 (64-bit)?)
    e6500 (2 threads): 6.0 (or 5.4, or 7?)


    Edit: added another PDF link
    Edit2: added alternative value for e6500 (2 threads)
    Edit3: added alternative values for e500mc, e5500 and e6500 (1 thread) from https://www.nxp.com/files-static/training/doc/ftf/2014/FTF-NET-F0139.pdf (page 3/4)
    Edit4: another source for alternative value for e6500 (1 thread)
    Edit5: added alternative value for e6500 (2 threads)
    Edit6: https://www.nxp.com/docs/en/supporting-information/DN-Digital%20Networking%20solution-2017.pdf (page 17) confirms "3.4 (64-bit)" value for e5500

    [ Edited by Andreas_Wolf 17.05.2023 - 14:34 ]
  • »09.08.12 - 22:54
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