In our impression, it seems that it is impossible for a vendor that relies on computing core R&D licenses to gain revenue and expand the market. It is impossible to release the saying that “eight-core smartphone chips do not exist at all†– but the actual situation is surprising, ARM James Bruce, head of corporate mobile solutions, personally conveyed this view to attendees during the ARM Technology Day event last week.
"For the smartphone platform, it is far more difficult to fully exploit the performance of the eight-core chip in actual program use cases than in the benchmark environment," Bruce pointed out. "But it is important to emphasize that, yes, the eight cores can indeed trigger a 'market effect' in the promotion process, but this is mainly due to the preference of some users for the number eight."
Of course, this kind of pursuit of the number eight is mainly manifested in the Chinese market, where the gesture of eight lucky numbers is loved by the general public.
“We do have a core design that can be tied to lucky numbers,†Bruce said.
The configuration scheme he refers to is ARM's big.LITTLE chip. Four of the more powerful cores are paired with the other four weaker cores. The high-performance core is responsible for transaction-intensive tasks, while the low-performance core is The less powerful task - the Exynos 5 Octa processor is a typical example of such a design. It matches four ARM Cortex-A15 cores with four Cortex-A7 cores, which are currently available on several models in multiple product lines such as the Samsung Galaxy S4, S5 and Note 3.
When running a smartphone benchmark that combines web browsing with MP3 simultaneous playback, Bruce said, "The way everyone sees it is that the 'big' core will only be occasionally activated and tasked, with most of the workload being ' The LITTLE' core is responsible for the completion."
He explained that overall, all cores are dormant or standby for about 75% of the time, while only one core is active for about 20% of the time.
"If you switch to a six-core configuration—or two 'big' cores with the 'LITTLE' core—the actual experience will hardly be affected," he explained further. “But it helps save the physical space that was originally occupied by the extra two computing cores.â€
Compressing the chip area means lowering production costs, especially for the upcoming 16nm FinFET advanced process technology, the cost per unit area becomes more and more expensive. "From the perspective of system-on-chip partners, the area change per millimeter of the chip solution will obviously have a huge impact on the final production cost," he added, adding that "any solution that can effectively reduce the chip size and the number of related components is Worth trying."
Among smartphones, Bruce said that few software instances actually use all four of the four high-performance cores in the eight-core big.LITTLE configuration. "For most smartphone workloads," he explained, "the six-core configuration is fully capable of meeting performance needs."
For now, the only mobile system chip solution with two big cores and four LITTLE cores appears on Samsung's Galaxy Note 3 Neo, Bruce points out – the processor uses a dual-core 1.7GHz Cortex A15 and A combination of four core 1.3GHz Cortex-A7.
But although the six cores may be the most suitable design for smartphones, Bruce reminds that many ARM partners are also building some system chips that are used on both smartphones and tablets, and "relative to smartphone design ideas." Tablet devices are designed with more consideration for the performance requirements necessary for multitasking. In view of this, each core on the high-performance Cortex-A15 processor has more computing tasks to complete.
More and more partners are now building eight-core system chips that are popular among Chinese users for tablet devices. More precisely, the proportion of such partners is rising rapidly. “Based on the 2013 market survey, we found that the total shipments of tablet devices at various price points around the world were approximately 250 million units,†Bruce pointed out. “The most interesting part of this is that 100 million of the 250 million tablet devices are chip products designed by Chinese system chip partners.â€
The ARM tablet device, which is responsible for chip supply by Chinese system chip makers, is in the midst of sales explosions. In contrast, the development trend of x86 notebooks is not optimistic.
Tablet devices have not only changed the development prospects of the computing industry, he explained, but also brought a huge shock to the supply chain in Asia. "If you have been careful, you will find that the situation of being in China and selling in China two or three years ago has been completely subverted," he pointed out - the historical relatives represented by Quan Zhi, Rui Xin Wei and Jing Chen. Shorter Chinese companies have begun to export a large number of system chips to the global market.
But will the Chinese market's preference for eight-core chips affect the global business environment as Chinese manufacturers' shipments grow? Or can these SoC vendors take advantage of the cost-effectiveness of a six-core approach?
“This is actually a customer perception,†concludes Bruce. “For markets outside China, is the eight-core solution more ideal or the six-core solution more popular? I really can't give a definitive answer.â€
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