Performance of different Broadcom SoCs?

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blapin
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PostPosted: Fri Feb 23, 2018 21:37    Post subject: Performance of different Broadcom SoCs? Reply with quote
I'm having trouble finding good general-purpose benchmarks for different CPU/SoCs, but I've noticed that my Asus RT-N66U w/Broadcom BCM5300 (MIPS 74Kc 600MHz) shows 300 BogoMIPS, while a Linksys EA6300 w/Broadcom BCM4708 (Dual ARM A9 800MHz) shows 1600 BogoMIPS per core.

Is this at all representative of their actual performance, or are BogoMIPS very much not comparable between MIPS and ARM architectures? The docs that I see claimed the 74Kc has maybe 2 MIPS/MHz while the A9 has 2.5 MIPS/MHz. Does this sound right? Or is the 74Kc truly outclassed by the A9 to such a massive extent?
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<Kong>
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PostPosted: Sat Feb 24, 2018 8:40    Post subject: Re: Performance of different Broadcom SoCs? Reply with quote
blapin wrote:
I'm having trouble finding good general-purpose benchmarks for different CPU/SoCs, but I've noticed that my Asus RT-N66U w/Broadcom BCM5300 (MIPS 74Kc 600MHz) shows 300 BogoMIPS, while a Linksys EA6300 w/Broadcom BCM4708 (Dual ARM A9 800MHz) shows 1600 BogoMIPS per core.

Is this at all representative of their actual performance, or are BogoMIPS very much not comparable between MIPS and ARM architectures? The docs that I see claimed the 74Kc has maybe 2 MIPS/MHz while the A9 has 2.5 MIPS/MHz. Does this sound right? Or is the 74Kc truly outclassed by the A9 to such a massive extent?


BogoMIPS for embedded devices is bullshit, as the support for this var is not added to the kernel for every cpu and thus sometimes you get completely misleading numbers. A good test is to compare using openssls speed test, it is normally single threaded and max out one core and give you the time it needed to encrypt different sizes.

E.g. some benches I did for other routers:

https://www.dd-wrt.com/phpBB2/viewtopic.php?t=287177

This shows you how fast "1" cpu core is compared to the others.

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jwh7
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PostPosted: Sat Feb 24, 2018 14:45    Post subject: Re: Performance of different Broadcom SoCs? Reply with quote
blapin wrote:
Or is the 74Kc truly outclassed by the A9 to such a massive extent?
Yes it is; MIPS vs ARM. Regardless, BogoMIPS just shows anywhere from 1/4 to 4x the CPU speed, but is otherwise entirely useless, as Kong alluded. Razz
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