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iPhone 6 takes large efficiency hit after Spectre patch

We all the time knew that patching the recently-discovered Meltdown and Spectre vulnerabilities will contain a drop in efficiency, particularly in older gadgets. The magnitude of the drop continues to be being examined, however the early outcomes don’t look good.

In no less than one case, an iPhone 6 noticed its Apple A8 lose 40% of its CPU efficiency after going from iOS 11.1.2 to 11.2.2. The take a look at was run by Dutch entrepreneur Melvin Mughal who bought the next outcomes on his telephone earlier than and after the replace.




Earlier than Spectre replace After Spectre replace Efficiency change
iPhone kind iPhone 6


iOS model iOS 11.1.2 iOS 11.2.2
Single-Core Rating 1561 924 -41%
Multi-Core Rating 2665 1616 -39%

Each single and multi-core efficiency are strongly affected and reminiscence entry took successful as properly. That was to be anticipated as each vulnerabilities exploit the CPU’s cache.

Because the take a look at was run on the identical telephone, the scores aren’t affected by the battery-related slowdown. That does make it more durable to gather extra information, nevertheless.

For instance, right here’s one result from Geekbench’s database the place the scores stay on pre-update ranges and another one, which is nearer to Melvin’s numbers. There are extra 11.2.2 scores like that, however it’s laborious to inform how a lot of the inconsistency is because of throttling attributable to an previous battery.

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