By: Wilco (Wilco.Dijkstra.delete@this.ntlworld.com), May 5, 2012 4:14 pm
Room: Moderated Discussions
Foo_ (foo@nomail.com) on 5/5/12 wrote:
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>Wilco (Wilco.Dijkstra@ntlworld.com) on 5/5/12 wrote:
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>>Linus Torvalds (torvalds@linux-foundation.org) on 5/5/12 wrote:
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>>>>
>>>>According to the above results, the A9 has 31% lower IPC than Bobcat, ie. the improvement
>>>>required is 45%. Krait/A15 should get there.
>>>
>>>Yeah, because 45% is easy to make up.
>>
>>Well the A15 has ~40% better IPC than A9, giving it the same ballpark IPC as Bobcat.
>
>40% better IPC on which kind of benchmark?
>Or is it only theoretical IPC?
The 40% is an average claimed by ARM, likely based on Spec. There are videos claiming much higher speedups for certain cases, in one test an 800MHz OMAP 5 beat Tegra 3 by a factor of 2.
Wilco
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>Wilco (Wilco.Dijkstra@ntlworld.com) on 5/5/12 wrote:
>---------------------------
>>Linus Torvalds (torvalds@linux-foundation.org) on 5/5/12 wrote:
>>---------------------------
>>>>
>>>>According to the above results, the A9 has 31% lower IPC than Bobcat, ie. the improvement
>>>>required is 45%. Krait/A15 should get there.
>>>
>>>Yeah, because 45% is easy to make up.
>>
>>Well the A15 has ~40% better IPC than A9, giving it the same ballpark IPC as Bobcat.
>
>40% better IPC on which kind of benchmark?
>Or is it only theoretical IPC?
The 40% is an average claimed by ARM, likely based on Spec. There are videos claiming much higher speedups for certain cases, in one test an 800MHz OMAP 5 beat Tegra 3 by a factor of 2.
Wilco



