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 ]