System Performance

To see how the new CPUs and memory subsystem translate into more real system performance, we move onto more representative tests such as PCMark. PCMark’s performance is affected by several factors: not only does raw performance of the hardware count but also we need to consider the individual system’s software stack. We’ve seen large differences between Android OS major versions where the improvements of the Android Runtime can be directly visible in subtests such as the Writing test. Also a SoC’s DVFS schemes and schedulers can have huge impacts on “performance-latency”, meaning how fast the CPUs can ramp up a workload. This directly translates in a lot more performance in several of PCMark’s subtests as in the default settings none of the tests actually represent the pure performance of the CPU if it were locked at maximum frequency on the performance cores. The results of the tests are also overall a good representation of “snappiness” of a device.

PCMark Work 2.0 - Web Browsing 2.0

In the web browsing test the Snapdragon 845 QRD manages to outpace the Pixel 2 XL by 20%. Here we’re also looking at performance across devices with different OS versions. The Google devices are running Android 8.1 while the Samsung devices were tested with Android 7.0. The Mate 10 Pro runs Android 8.0 while the Mate 9 still had 7.0. The Qualcomm QRD we tested ran Android 8.0.

Again the performance increase over Snapdragon 835 devices isn’t all that great. DynamiQ allows for far more efficient thread transitions between the CPU cores and subsequently I expected Qualcomm to take advantage of this through more aggressive scheduling resulting in more than just a 20% increase. The difference between the Mate 9 and Mate 10 here is a good example of what a software configuration change can bring in terms of performance (both devices employ same performance CPU configurations). Samsung’s Exynos’ SoCs still use GTS scheduling and have non-optimal performance-latency resulting in bad scores, amplified by the fact that Samsung’s memory performance is also underwhelming when compared to the Snapdragon and Kirin SoCs.

PCMark Work 2.0 - Data ManipulationPCMark Work 2.0 - Writing 2.0

The Data Manipulation and Writing 2.0 tests make heavy use of the Android runtime and APIs and also a very memory latency sensitive. Between the best showings of the Snapdragon 835 variant of the S8 and the Pixel 2 XL in each respective benchmark, the Snapdragon QRD845 showed conservative increases of 8 to 14%. The Exynos SoCs lacklustre performance is again hampered by software and by bad memory performance.

PCMark Work 2.0 - Video Editing

The video editing test is PCMark’s weak-point as it’s bottlenecked by things such as OS API overhead, and why we see tight grouping of performance results across a large range of SoCs. The Snapdragon 845 ends up high, but below the Pixel 2 XL. I would not put much weight on the results of this test as they’re not necessarily representative. Futuremark claims that the test is a lot more sensitive in mid- and low-range devices which can exhibit performance issues.

PCMark Work 2.0 - Photo Editing 2.0

The photo editing test makes heavy use of Renderscript and use GPU acceleration to apply various effects on an image set. The QRD845 here shines as it’s able to showcase a 38% performance improvement over the Pixel 2 XL. Again the test not solely tests the raw performance of the system but also how optimized it is in terms of the software stack. This can be seen in the Kirin vs Exynos devices as Huawei’s phones vastly outperform Samsung’s devices in this test.

PCMark Work 2.0 - Performance

Overall PCMark’s performance score for the QRD845 increases by 17% over the Pixel 2 XL. Disregarding the video test, we see a similar scenario as in the synthetic tests as the new SoC’s CPU performance increases are lower than we had expected. Still the Snapdragon 845 is able to top the charts and should adequately power 2018’s flagship devices.

For 2018 we are reviewing our mobile benchmarking suite and altering some of the benchmarks we use. One of the changes in the way we benchmark devices is that we’re moving away from standalone browser and rather are benchmarking the OS’s WebView implementations. In general this seems to be a better choice for testing device experience as there is a lot of content that is being consumed via WebView windows. We also avoid the argument about different browser performance and since Google has now made WebView an updatable Play Store component we should also have valid comparisons older devices and systems. On the iOS side we do the same as we now benchmark browser tests within a WkWebView shell.

WebXPRT 2015 - OS WebView

Starting off with WebXPRT 2015 for a last time before we’ll retire it in favour of WebXPRT 3, we see the QRD845 performing fantastically. Here the 44% performance increase over the Pixel 2 XL is a lot more in line with what we had expected of the new SoC. The QRD845 is even able to catch up a lot with Apple’s newest A11 and Monsoon cores in this test.

To keep up with the ever changing landscape of the developing web, we’re also retiring past JavaScript benchmarks in favour of a brand new and more representative benchmark developed by the WebKit team and welcomed by Google; Speedometer 2.0.

Speedometer 2.0 - OS WebView

Here the Snapdragon 845 showcased another healthy performance increase of 37% over the Snapdragon 835 devices. Apple’s superior JavaScript performance can be attributed to a much faster and more optimized Nitro engine while Google’s V8 has only seen meagre improvements over the years. Notable is the Apple A11’s massive performance jump over the A10 – vastly increasing the distance to Android devices.

CPU & Memory Subsystem GPU Performance & Power Estimates
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  • Tigran - Monday, February 12, 2018 - link

    Any ideas why S821 overperforms both S845 and S835 in Geekbench 4 Floating Point Performance Single Threaded? Reply
  • Andrei Frumusanu - Monday, February 12, 2018 - link

    The original Kryo had very robust FP execution pipelines while having weaker integer and memory subsystems. Please keep in mind those are normalized per clock, not absolute performance. Reply
  • Tigran - Monday, February 12, 2018 - link

    Does it mean the new Kryo in S835 & S845 compromises FP performance to obtain better performance in integer calculations (per clock)? Reply
  • Andrei Frumusanu - Monday, February 12, 2018 - link

    The new Kryo's have nothing to do with the microarchitecture of the original S820 Kryo as the former are ARM designs while the latter was a full Qualcomm design - you can't say compromise as it's not a deliberate choice but that's just the differences between the CPUs. Reply
  • jjj - Monday, February 12, 2018 - link

    And efficiency is not factored in, Kryo was not great at that. Reply
  • gregounech - Monday, February 12, 2018 - link

    First word of System performance page should be "Now we see how" and not "How we see how" :)

    Otherwise great job Andrei & Ryan!
    Reply
  • tuxRoller - Monday, February 12, 2018 - link

    From fd.o:

    "The a6xx GPU is an iteration of the a5xx family so most of the GPU side code
    looks pretty close to the same except for the usual register differences. The
    big different is in power control. On the a5xx there was a rudimentary device
    called the GMU that did some basic power stuff but left most of the complexity
    to the kernel. On the a6xx the power complexity is being moved to a component
    called the GMU (graphics management unit)."

    https://lists.freedesktop.org/archives/dri-devel/2...
    Reply
  • GC2:CS - Monday, February 12, 2018 - link

    Seems like qualc is at their pre 810 days again. It’s definitely going to be a standrad of android soc this year.
    Regarding the entire mobile landscape, I think Qualcomm dropped the ball with legacy ARM designs, and everyone got somewhat lazy with their own design and IPC. And it looks kind of poor now that Apple is now on their sixth gen of custom, each bringing a significant improvement.

    GPU got more impresion. Obviously they’ve done a lot of work over the years. It is going to be interesting if they can claim the crown from Apple this year for that. On the other hand Apple got a bit lazy with the GPU too - with A9 and A10 being excessively power hungry because they reused the same core clocking it higher.
    It’s super impressive they managed to match A11 at peak, but they should not slow down as that is Apple’s first GPU and the efficiency they pulled over A10 is just insane - this year is gonna be exciting.

    But OEM’s migt want to bring up somewhat more than just make device upgrades rely on some%qeuieckerer moniker.
    Reply
  • generalako - Monday, February 12, 2018 - link

    Andrei Frumusanu has completely lost his legitimacy as a writer on Anandtech. In this post here, he makes the ridiculious claim that Snapdragon 845 should offer "expected performance improvement to 39-52%", despite the fact that Qualcomm themselves very clearly state "up to 25% improvement" on their launch and on their own site: https://www.anandtech.com/show/12114/qualcomm-anno...

    Now, 2 months later, he merely repeats what Qualcomm said all along, based on the results he got from the device: an overall 20-25% performance improvement.
    Reply
  • StormyParis - Monday, February 12, 2018 - link

    On the article you read, Qualcomm's lists performance at iso-process and frequency (34% for Geekbuying, 48% for Octane), to which you then add the performance gain due to the frequency. That makes Andrew's figures cogent, and your comment idiotic. Reply

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