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Samsung explains how big.LITTLE works on chips like Exynos 5 Octa

Posted: , by Victor H.

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Samsung explains how big.LITTLE works on chips like Exynos 5 Octa
Samsung’s Exynos 5 Octa is one possibility for the upcoming Galaxy S IV flagship, the most anticipated Android device this year, and while we don’t yet know about the S IV’s internals, Samsung has posted a video explaining how the big.LITTLE setup on an octo-core chip works.

big.LITTLE is ARM’s architecture where high-performance Cortex A15 cores (big) are paired with energy efficient Cortex A7 (LITTLE) cores that take over when non-demanding tasks are at play.

It’s interesting to see the whole setup in action, and to do that we are seeing a setup made out of two A15 cores and three A7s with no graphical accelerator shown running the Android system. You can see how the MP scheduler correctly assigns each task to the right core depending on its intensity.

While Cortex A15 is great performer, it is too power hungry to be used alone in smartphones and that’s why it is paired with the A7.

source: Samsung

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posted on 14 Feb 2013, 08:29 5

1. _Bone_ (Posts: 2155; Member since: 29 Oct 2012)

The jury is still out there on exactly how efficient this technology really is over regular smartphone usage (and with the SIV likely kicking off with an S4 Pro, the Octa still needs work to do), this is very exciting time for power saving technologies. Thx for the vid!

posted on 14 Feb 2013, 09:20 8

5. g2a5b0e (Posts: 3829; Member since: 08 Jun 2012)

Even if the SIV doesn't have the Octa, it will definitely not feature a Snapdragon chip. The only reason the SIII in the U.S. had one last year was because Samsung had not yet integrated LTE with the quad-core Exynos chip. It had the quad-core Exynos everywhere else. Rest assured that whether or not it's the Octa, the SIV will have a Exynos chip in it worldwide.

posted on 14 Feb 2013, 10:18

7. _Bone_ (Posts: 2155; Member since: 29 Oct 2012)

I'd love to take your word for it, but at this point my speculation is as good as yours, and if the Exynos 5450 is not ready (let it be quad or octa variant), there's so much Samsung can do. The Nexus 10 dual core is power hungry and not quite revolutionary in benchmarks, so that leaves Sammy with the S4 Pro if they want record breaking performance.

posted on 14 Feb 2013, 13:38 4

11. g2a5b0e (Posts: 3829; Member since: 08 Jun 2012)

Samsung has already stated that only Exynos processors will be used in their flagship phones henceforth, so it's not just speculation. The only question is what make. Although, based on what the Samsung engineer had to say about it a few weeks ago, my bet would be on the Octa in the SIV, & then an overclocked version in the Note 3.

posted on 14 Feb 2013, 15:32

13. darac (Posts: 2156; Member since: 17 Oct 2011)

Indeed, the benchmarks appeared in january


..I hope they make a die shrink to 20nm for the Note 3, which would take away all the power consumption worries and allow for some serious over clocking..in other words, turning the Note 3 into a true pocket PC.

posted on 14 Feb 2013, 15:35

14. HDShatter (Posts: 1021; Member since: 17 Jan 2013)

The exynos 5s will not be ready for phones any time soon. If they use an exynos it will be an exynos 4 and significantly slower than an s4 pro.

@Darac, a phone will never replace my PC, it might if all you do is look at youtube videos and social media. For anyone thats active on their pc playing games, multitasking, editing, modeling and such a phone will never replace the real deal.

posted on 14 Feb 2013, 17:24 1

15. darac (Posts: 2156; Member since: 17 Oct 2011)

So it won't be ready because you say so?
What about those benchmarks?
You think Samsung will blow it like that now that they have the ball?
And use S4 chip for this ginormous yield, instead of their own? Lol dude.
Think again.

And I was referring to processing power.. with, say, 2.5 Ghz Exynos octa and Mali 658, you have a pc-grade speed.

posted on 20 Apr 2013, 14:03

16. serporys (Posts: 16; Member since: 20 Apr 2013)

Qualcomm will probably use something like this in the future, too, and so will others.

posted on 14 Feb 2013, 08:38 11

2. erdpov (Posts: 67; Member since: 07 Dec 2012)

I believe Exynos will power the sammy's most powerful and legendary smartphone. S4pro is not flagman processor, Sammy needs its own cpu.

posted on 14 Feb 2013, 08:56 3

3. InspectorGadget80 (unregistered)

Im geussing their chip will be on the galaxy note III in OCT

posted on 14 Feb 2013, 09:14 4

4. shuaibhere (Posts: 1986; Member since: 07 Jul 2012)

Hoping that s4 comes with this chip inside...

posted on 14 Feb 2013, 11:56

8. InspectorGadget80 (unregistered)

Too early for that when gs iv bout too launch this spring / summer

posted on 14 Feb 2013, 13:12

10. omar300 (Posts: 209; Member since: 24 Jun 2012)

it might but it will be A7 quad core and A15 dual core. not quad core and quad core. i honestly rather have more power Conservative processor because i dont play games.
i would like to see how snapdragon 800 is like.
IF i buy new phone this year i would wait till all the phone are reviewed and benchmarked. i suggest same to u. dont rush.

posted on 14 Feb 2013, 09:47 4

6. Tux_Alan (Posts: 74; Member since: 30 Jan 2013)

Cannot wait to see real power efficiency figures, with a GPU and different tasks undertaken and see if this baby becomes a more tablet-oriented chip..... But bloody hell, the mere thought of four A15 cores working together opens up a whole new world of possibilities!

posted on 14 Feb 2013, 12:37 3

9. rd_nest (Posts: 1656; Member since: 06 Jun 2010)

Dear PA, please understand the video properly. This video title has Exynos Octa in title, but it doesn't have anything related to Exynos Octa specifically. It's actually a video done by ARM and posted in it's ARMflix channel back in Oct 2012 --http://www.youtube.com/watch?v=G3cwbskxj6k

The engineer in the video clearly says that he works for ARM Dietmar Eggemann (dietmar.eggemann@arm.com)

This is just a sample test chip which doesn't even have a GPU. It uses 2x A15 and 3x A7 cores. It's noway related to Exynos Octa. It's just a technical demo, nothing more than that.

Samsung semiconductor channel simply added the ARM video in their own channel, that's all happened. It's in reality a 4 month old video from ARM.

posted on 14 Feb 2013, 13:48

12. Joshing4fun (Posts: 1237; Member since: 13 Aug 2010)

What I really wanna know is if it can play nicely with LTE so we will get this processor in the US.

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