iPhone Performance and Battery Age
첨부 '8' |
|
---|
Dec 18, 2017 - John Poole
A Reddit post from last week has sparked a discussion regarding iPhone performance as a function of battery age. While we expect battery capacity to decrease as batteries age, we expect processor performance to stay the same. However, users with older iPhones with lower-than-expected Geekbench 4 scores have reported that replacing the battery increases their score (as well as the performance of the phone). What’s going on here? How many phones are experiencing decreased Geekbench 4 score?
To answer these questions I’ve plotted the kernel density of Geekbench 4 single-core scores for the iPhone 6s and the iPhone 7 running different versions of iOS. Scores obtained in low-power mode are not included in the distribution.
iPhone 6s
Here are the charts for the iPhone 6s:
![iphone02.png](https://www.hooni.net/xe/files/attach/images/2909/035/088/7e3408df495584aa2af7bafab2a52ef9.png)
![iphone03.png](https://www.hooni.net/xe/files/attach/images/2909/035/088/3b23b1c42a94095fd89d159c98767c50.png)
The distribution of iPhone 6s scores for iOS 10.2.0 appears unimodal with a peak around the average score. However, the distribution of iPhone 6s scores for iOS 10.2.1 appears multimodal, with one large peak around the average and several smaller peaks around lower scores. Under iOS 11.2.0 the effect is even more pronounced.
iPhone 7
Here are the charts for the iPhone 7:
![iphone05.png](https://www.hooni.net/xe/files/attach/images/2909/035/088/b7b32b69534128195dfead2523a56f0f.png)
![iphone06.png](https://www.hooni.net/xe/files/attach/images/2909/035/088/999616bdeed4c21298905bed832bffe6.png)
![iphone07.png](https://www.hooni.net/xe/files/attach/images/2909/035/088/925b23b895bb570b225c9eef67ee3ef8.png)
The distribution of iPhone 7 scores under iOS 10.2.0, iOS 10.2.1, and iOS 11.1.2 appears identical. However, the distribution changes with iOS 11.2.0 and starts to look like the iPhone 6s distribution from 10.2.1.
Performance and Battery Age
So what’s going on here?
First, it appears the problem is widespread, and will only get worse as phones (and their batteries) continue to age. See, for example, the difference between the distribution of iPhone 6s scores between 10.2.1 and 11.2.0.
Second, the problem is due, in part, to a change in iOS. The difference between 10.2.0 and 10.2.1 is too abrupt to be just a function of battery condition. I believe (as do others) that Apple introduced a change to limit performance when battery condition decreases past a certain point. Why did Apple do this? kadupse on Reddit offers the following explanation:
Many iPhone 6s devices were shutting down unexpectedly, even after the battery replacement program (Which many people weren’t entitled to use). Because degraded batteries last much less and end up with a lower voltage Apple’s solution was to scale down CPU performance, it doesn’t solve anything and is a bad experience… but it’s better than having your device shutdown at 40% when you need it the most.
Apple acknowledged the sudden shutdown issue that affected the iPhone 6 and iPhone 6s earlier this year. However, does the same issue affect the iPhone 7? Apple appears to have added a similar change to iOS 11.2.0 for the iPhone 7.
If the performance drop is due to the “sudden shutdown” fix, users will experience reduced performance without notification. Users expect either full performance, or reduced performance with a notification that their phone is in low-power mode. This fix creates a third, unexpected state. While this state is created to mask a deficiency in battery power, users may believe that the slow down is due to CPU performance, instead of battery performance, which is triggering an Apple introduced CPU slow-down. This fix will also cause users to think, “my phone is slow so I should replace it” not, “my phone is slow so I should replace its battery”. This will likely feed into the “planned obsolecense” narritive.
[출처] https://www.geekbench.com/blog/2017/12/iphone-performance-and-battery-age/
-
iOS8을 영접하는 올바른 자세
애플이 드디어 8번째 iOS 메이저 업데이트를 실시했다. 지난 6월 세계 개발자 대회에서 최초로 발표된 iOS8이 17일 업데이트 된 것. iOS 8.0은 더욱 향상된 음성비서 서비스 시리를 비롯해 새로운 헬스 관리 앱, 더욱 향상된 알림 등 다양한 새 기능을 제공할... -
iPhone Performance and Battery Age
Dec 18, 2017 - John Poole A Reddit post from last week has sparked a discussion regarding iPhone performance as a function of battery age. While we expect battery capacity to decrease as batteries age, we expect processor performance to stay... -
IT Companies In China Are Hiring Cheerleaders To "Boost" Job Productivity
헉.. 이럴 수가.. 중국의 IT 회사들이 업무 효율 향상을 위해 치어리더를 고용한다니.. [출처] http://9gag.com/gag/aq2e6Rp -
IT 엔지니어가 일할 때는 방해하지 말라
대부분의 경우 5분 간의 방해가 어떤 일에 집중하고 있는 기술자의 생산성에 1시간 이상의 손실을 불러온다. IT 분야의 업무라는 것이 스토브 위에 올려놓고 잊어버린 파스타 냄비처럼 끓어 넘치는 경향이 있다. 하지만 이는 해야 할 일을 잊어버리고 있었기 ... -
It's up to you to break generational trauma
세대로 이어지는 트라우마를 깨는 것은 너에게 달려 있다. It's up to you to break generational trauma -
No Image
JTBC 밤샘토론 36회 유시민 전장관 마지막발언
JTBC 밤샘토론 36회 유시민 전장관 마지막 발언 -
JTBC.손석희가 한 건 했네요.. 가정맹어호
가정맹어호 가혹한 정치는 호랑이보다 무섭다는 뜻으로, 혹독한 정치의 해독이 큼을 이르는 말 - 춘추시대 공자가 한 말 - 프랑스인들은, 세금 폭탄 정책을 만든 루이 14세 재무상 콜베르의 죄만 묻지 않았습니다. 콜베르를 앞세우고 시치미 떼던 루이 14세를 ... -
KBS1 역사저널 "그날" 봐야지~ ㅎㅎ
[펌] 조선의 국모, 민비 척족의 부패상 - 편집이 얼마나 중요한지 깨닫게 되는 제목. - 긍정적인 면과 부정적인 면이 모두 소개됐지만, 특정 부분만 딱 잘라서 편집 - 이 원문을 만든이가 아마도 교학사 교과서 쪽 사람이 아닐까 하는 생각이.. - Read More
-
Laguna Beach 레스토랑 6곳
# Laguna Beach 미국 서부 최고의 7마일 해변을 따라 럭셔리 저택들과 리조트 호텔들이 이어지고 일년 내내 지중해성 기후에 태평양의 바람과 태양으로 반짝이는 모래사장이 펼쳐있다. 여기 라구나 비치에 있는 괜찮은 레스토랑 6곳을 간단히 소개한다. # 1. ... -
No Image
LG U+ (엘지 유플러스 070과 휴대폰)
# 휴대폰 (휴대폰 114 또는 1544-0010 문의) 정지상태 기본요금 4,400원 - 30일 후 발신 정지 - 90일 후 수신 정지 (연 최대 2번 연장; 180일 후 착신 정지) > 수신정지 되지 않도록 하는 방법 : 군입대, 해외 유학/근무, 행방불명, 형집행 등에 대한 서류 접... - Read More