Performance

The original successor to the Pre was supposed to be the first Tegra 2 smartphone on the market. The HP acquisition opened up bidding once again to everyone, even Intel had a seat at the table this round. Qualcomm emerged victorious, pushing out NVIDIA as well as Palm's previous favorite - TI. Snapdragon SoCs were to be used in everything from the entry level Veer and Pre 3 to the TouchPad.

While the Veer and the Pre 3 both use single core 45nm Snapdragon SoCs, the TouchPad uses Qualcomm's dual-core APQ8060. You may be more familiar with the MSM8x60 used in the HTC Sensation 4G and HTC EVO 3D, the APQ8060 is a close relative that simply lacks any integrated modem. For a WiFi only TouchPad, the APQ8060 makes sense.

On the CPU side the APQ8060 has two 45nm Scorpion cores that can run at up to 1.5GHz. In the WiFi TouchPad, HP's implementation limits max frequency to 1.2GHz (1188MHz to be exact). AT&T has already announced a GSM TouchPad 4G which uses a 1.5GHz APQ8060. There shouldn't be any difference between these two models, potentially some better chips from the yield curve but otherwise the clock speed differences are all controlled in software.

Architecture Comparison
  ARM11 ARM Cortex A8 ARM Cortex A9 Qualcomm Scorpion
Issue Width single-issue dual-issue dual-issue dual-issue
Pipeline Depth 8 stages 13 stages 9 stages 13 stages
Out of Order Execution N N Y Partial
FPU Optional VFPv2 (not-pipelined) VFPv3 (not-pipelined) Optional VFPv3-D16 (pipelined) VFPv3 (pipelined)
NEON N/A Y (64-bit wide) Optional MPE (64-bit wide) Y (128-bit wide)
Process Technology 90nm 65nm/45nm 40nm 45nm
Typical Clock Speeds 412MHz 600MHz/1GHz 1GHz 1GHz+

Architecturally the Scorpion core looks a lot like a better designed ARM Cortex A8. It's still a dual-issue, in-order architecture (with limited support for instruction reordering). Where the Scorpion core really improves on the A8 is that it has a fully pipelined FPU as well as a 128-bit wide NEON pipeline. The 8660 has a rather meager 512KB L2 cache shared between both cores. Running integer code the Scorpion core typically performs a lot like a Cortex A8 at the same frequency, but allegedly at lower power consumption. Thanks to its custom design and layout, Qualcomm's Scorpion core can easily run between 1.2 - 1.5GHz on the same process and with similar power consumption as 1GHz Cortex A8s.

The 8x60 series simply takes two of these Scorpion cores and puts them on the same die.

Qualcomm prides itself on having an asymmetrically clocked multicore architecture with the 8660 series. This means that each core can operate at its own independent frequency (e.g. CPU0 could run at 1188MHz while CPU1 is running at 384MHz). The verdict is still out on asymmetrically clocked processor cores as being a net win in mobile devices. At least on the desktop, Intel proved that you're better off running all cores at the same frequency and just power gating those that are idle. It's very rare that you need one core running at 50% for a prolonged period of time, usually you want your cores running at max speed so they can finish whatever tasks are at hand before returning to a deep sleep state.

To validate my theory (well really Intel, and now AMD's theory) I took a look at what frequencies the the first CPU core spent its time at during a mixture of idle, light and heavy usage. Thankfully webOS is a truly open Linux platform and with a little effort you can SSH into the TouchPad and gain access to a lot of very helpful information.

The data above shows you the operating frequencies of CPU0 and the time spent at each frequency. Let me reorganize the data to help make my case a little better:

HP TouchPad Operating Frequencies
  192MHz 384MHz - 1134MHz 1188MHz
Time Spent at Frequency 79.7% 5.3% 15.0%

The majority of the time CPU0 was at its lowest operating frequency: 192MHz. This makes sense since the tablet was sitting around doing nothing for a lot of the time, not to mention that when reading emails or web pages the CPU can throttle down completely until you scroll. The second CPU core seemed to behave similarly, however it actually spent a lot of time being shut off completely from what I can tell based on the counters in webOS.

This seems to tell me that, at least based on my usage of the TouchPad, I'm not sure how much benefit there is to having multiple power/frequency planes in the AQP8660. It seems like you would get the same benefit out of having one power/frequency plane and just power gating any idle cores.

The APQ8060 features an Adreno 220 GPU, the fastest Qualcomm has to offer today. While 3D gaming is still in its infancy on all mobile devices, it's good to see that HP hasn't at least sacrificed 3D performance in building the TouchPad. Note that the Adreno 220 in the TouchPad is still lags behind the PowerVR SGX543MP2 in the iPad 2, but this generation no one spent die area like Apple did on the A5. Note that Apple's aggressive move with the A5 this year has ensured that future SoCs from NVIDIA, Qualcomm and TI will likely be much larger than they have been in the past.

The entire SoC has a dual-channel LPDDR2-533 interface to main memory, giving it the memory bandwidth necessary to drive the TouchPad's 1024 x 768 display resolution.

From a raw performance standpoint, the APQ8060 is among the fastest on the market today. At 1.2GHz there's not enough of a clock speed advantage for it to be faster than NVIDIA's Tegra 2, but the chip comes close. At 1.5GHz, at least based on what we saw with the HTC Flyer, Qualcomm's Snapdragon is very competitive with the Tegra 2's 1GHz Cortex A9s. Why HP opted for a 1.2GHz configuration in the WiFi TouchPad and a 1.5GHz speed in the AT&T version isn't clear to me.

Unfortunately despite having enough CPU power to run Android well, there are definite performance issues in webOS. Let's start with the first issue - application launch time. The table below is pretty simple to understand, I timed how long it took to boot the four major tablet platforms as well as how long it took to launch various, commonly used apps:

Application Launch Test
  Apple iPad 2 HP TouchPad RIM PlayBook Samsung Galaxy Tab 10.1
Boot Time 22s 1m 17s 1m 17s 31s
Browser 1.1s 3s 3.9s 1.4s
Email 2.0s 9s N/A 2.5s
Music 2.5s 5.8s 5s 1.5s
Photos 1.0s 5.7s 2.8s 1.8s
YouTube 2.4s N/A 6.1s 8.2s
Maps 1.1s 7.1s 9.6s 2.8s
App Store 6.3s 9.5s 5.7s 2.7s

Both the TouchPad and the PlayBook take entirely too long to boot. RIM told me the PlayBook's long boot times are due to the fact that the entire OS is validated with a cryptographic hash to ensure a secure boot environment at startup. It's unclear to me what the excuse is for webOS' lengthy boot time. Thankfully, as long as you keep your tablet charged you shouldn't have to do much more than wake it from sleep. Unfortunately application launch time isn't much better.

In general, apps on the TouchPad take three times as long to start up as apps running on the Galaxy Tab 10.1. This isn't a CPU issue (the Cortex A9 isn't 3x faster than Qualcomm's Scorpion core), I'm guessing this is a webOS tuning issue. The slow app launch time even applies to a running app spawning additional cards. Replying to an email spawns a new card which itself takes a 3 seconds to appear. Things like this should be instantaneous, any lag here is going to make a platform feel slow. HP should know this.

The application launch time is livable however, it's something you can get used to and hope that HP will improve over time. There are two bigger issues with the TouchPad's performance that are harder to deal with.

The first is UI frame rate. At times the TouchPad's UI seems to run at a reasonably high frame rate, I'd say somewhere around 30 fps. However all too often that UI thread drops well below 30 fps. I've seen this happen on Honeycomb but not nearly as consistently as it does on the TouchPad. All tablets I've tested have a higher framerate UI than the TouchPad. What's most frustrating is that the BlackBerry PlayBook OS, a clear copy of a lot of what I love about webOS, executes the UI faster than HP does on the TouchPad.

A low UI frame rate isn't as acceptable in this post-iOS world as it once was, but once again it's something you can get used to and pray for the best down the road. The ultimate issue with the TouchPad is its multitasking performance.


Laggy behavior while multitasking, not uncommon on the TouchPad (note the empty notification up top)

With a few benign apps open, the TouchPad multitasking experience is fine. You get to enjoy the quick app switching of webOS and all is good in the world. However open up and start really using a couple of apps that each are active consumers of CPU and I/O and the TouchPad can slow to a crawl. The best way I can describe it is like using a netbook that's constantly swapping to a very slow hard drive. The UI will periodically stop responding to taps on the screen only to either queue them up and execute a bunch of actions after a few seconds or just fail to recognize them entirely. It's beyond frustrating because the TouchPad is the first tablet that I actually can multitask on yet the multitasking experience is a performance nightmare. I fully believe this is a webOS linux optimization issue and not an insurmountable hardware limitation. Whether or not HP will correct it quickly is another thing entirely.

Potentially hand in hand with the performance issues are sheer bugs in webOS 3.0 itself. Random reboots are prevalent though not incredibly frequent. I already mentioned audio dropping out during calls and there's a screenshot above of an unpopulated notification window. The TouchPad is in dire need of software updates. I don't mind that HP released it in this state since it seems that nearly all of its competitors behave similarly and I can simply avoid recommending buying it until the issues are fixed. However, I will mind if the TouchPad isn't updated to address these problems in a timely manner. Competition is good, but these competitors have to behave like winners if they want to stick around.

Beats Audio & Touch to Share WiFi Performance & Battery Life
POST A COMMENT

67 Comments

View All Comments

  • vision33r - Sunday, July 17, 2011 - link

    I am not kidding, because I don't think these tablets today are useful at all. I've used the Asus Transformer with the KBD dock since it was out and I find the experience from counter-productive to just plain atrocious. Today's ultra portable laptops and netbooks got it all covered.

    Honeycomb is really a poor Tablet OS because without my keyboard dock, I felt the touchscreen UI is really lacking in this form factor. So many apps just aren't well designed for the landscape mode. Even native apps like Zinio or book reader apps perform so awfully slow on Honeycomb like they aren't optimized.

    I've used the HP Touchpad just the other day and found it to be snappy and a pleasurable experience. But I'm not sold, it felt like it was missing something. Apps!

    That's why I said people don't really want a tablet, they want the iPad because there are thousands of apps for everything that you need.

    The OS really is not the most important feature of these OSes, it's the apps. The OS with the best and most abundant quality apps is the one people want.
    Reply
  • Conner_36 - Monday, July 18, 2011 - link

    thats why people choose pc over mac more often than not. Reply
  • tecknurd - Tuesday, July 19, 2011 - link

    Not true. Gamers will be using Windows. Mac still works for everybody except gamers. Game industry is housed in Windows.

    FYI, Mac is a PC too. I prefer to say Mac VS Windows.
    Reply
  • cknobman - Tuesday, July 19, 2011 - link

    Sure a Mac will work but the majority of people do not choose them, sorry that is a fact not an opinion.

    The reason for that is also in large part due to the selection of applications and compatibility.
    Reply
  • Lask001 - Monday, August 22, 2011 - link

    No, people use macs because they are easy. Windows still have better applications, they just aren't as idiot proof. Reply
  • anishannayya - Monday, July 18, 2011 - link

    The iPad is a tablet.

    I'm still rocking the traditional tablet: running Windows. :)

    Can't go wrong with a ThinkPad X Series Tablet Computer (running Win. 7).
    Reply
  • dookiex - Wednesday, August 17, 2011 - link

    I have one of the old school traditional tablets. It's one of the most useless things ever thought up since the touch interface is rarely used and the damn notebook is like a brick. I'll stick with my iPad thank you very much ;) Reply
  • thesaxophonist111 - Monday, July 18, 2011 - link

    Exactly. No one cares that the iPad runs iOs. What they care about is the thousands of apps it has. If another tablet comes out with that many apps, and a competitive price, Apple's in hot water. That will be hard. Reply
  • vol7ron - Monday, July 18, 2011 - link

    I'm not sure that's true.

    The number of useful apps is really limited, which is one of the reasons many people never complained about the initial 200 app limitation - you just delete one of the silly apps that you never really used. Those that are useful are very popular and programmers have ported them across multiple OSes.

    I think people are more likely to get the OS that also meshes with existing devices, mainly because they're app-locked. If you spent $300 on apps for your phone, you probably don't want to switch OSes and spend another $300 for your tablet. Plus, your existing apps will sync between devices (notes, email, budget apps). Having everything Apple (notebook, phone, tablet, TV, Air) makes things easier for some people.

    People might not care about the OS so much as efficiency and performance (battery life and run speed).
    Reply
  • dookiex - Wednesday, August 17, 2011 - link

    Actually, it is true. Let's forget the total number of apps available and instead focus on the number of USEFUL apps. iOS and the App Store still has that in spades. For the casual consumer, the App Store is filled with quality casual games and misc. entertainment apps. For the productivity-minded user, iOS and the App Store is STILL the go to place for productivity apps. Just take a look at professional apps that are available to business users (most if not all DM vendors have their own apps that will hook you into your enterprise DM, there's also CRM apps that hooks into the big CRM enterprise apps, same goes for RM, Gotomeeting and Webex first appeared on iOS outside of their desktop counterparts, etc. Heck, there's been actual court trials where the counsel brought in the iPad to show all their exhibits because out of all the different means of presenting exhibits, the iPad was the best fit for the purpose).

    The reality is that the BULK of the iPad customers purchased it because of what was promised in the commercial and news articles. Namely something that is easy to use and serves basic computing needs well (browsing the internet, watching videos, listening to music, and of course, apps). They've also heard about how the iPad has been utilized in many different professional capacities (education, medical, etc.). THAT'S what is moving the iPad off the shelves as soon as it arrives on aforementioned shelves.

    For all intent and purpose, the majority of iPad owners bought it not because they wanted a tablet. The reality is that they may not even know that there's a class of computers called tablets. All they know is that Apple makes this product called the iPad and that the iPad does pretty much everything they think a computer can do and it's like carrying around a magazine. Luckily the iPad fits into the minds of most consumers as to what a computer is and should do. We of course know better and know that a full computer is MUCH more capable than any iPad but then again, we're not just some Joe Shmoe, we're at the minimum, power users. We're not the core iPad customers but luckily, the iPad has been sufficient even for folks like us.

    So, ultimately how does something like webOS, Windows Phone 7, and android fit into the equation? Well, they basically don't because they really haven't been able to promise the "does almost everything your computer can do" as well as Apple has. The reason for this is due to 3rd party app support. Face it, the core audience is not going to give a hoot if something like whatever the iOS game of the week is will eventually hit android. They just want whatever device will play whatever app that is buzzing around with hype now. For the enterprise, the enterprise is not going to go for a device which currently isn't supported currently by their DM vendor (you can tell that I work in IT and deal a lot with content management systems). They need the support now, not later. Developers and vendors alike develop for iOS first and android they often will or will not develop for but there is a big delay before it hits platforms other than iOS. Now you might argue that android outsells iOS but think about this. The devices that are flying off the shelves for android are phones. If you go into a mobile phone shop or a big box retailer, the bulk of the phones they sell are android devices. Even for a person who just wants a simple phone to make calls and text on, there's a VERY high possibility that they will walk out with a android device. Do they necessarily care or even know about android? No, they just wanted a phone and it was probably on sale or free so they walked out of the store with it. It can be pretty safe to say that a HUGE chunk of android users didn't intentionally go out to buy a android device, they just needed a phone and that was the one that was probably pushed on them at the store. Let's face it, if dad or mom who just needs a phone to replace their broken dumb phone and they walk into Verizon and the sales rep goes "Oh, you want something economical? Here's a great phone, it's $50 with contract AND it's JUST LIKE AN IPHONE!" guess what, they are probably going to leave the store with that phone because #1 it's cheap and practically free #2 they don't really know what android or iOS is but when someone says that "it's just like an iphone" it sounds like a good thing.

    To summarize, the majority of users DO NOT CARE. As long as the thing does what they expected it to do. In this regard, Apple keeps winning because out of everything else out on the market today, their products requires the LEAST amount of learning to use (admittedly there are quite a number of confusing settings and features for most users in Apple products but the key take away is that even without knowing about those features and settings, one can be pretty sure that the product will still work up to the customer's expectations because the core features are pretty straight forward and anywhere that Apple could cut down on direct user intervention, they do, think of it like a toaster, you really don't need instructions to operate a toaster, Apple is basically making things as close to brain dead operations to a toaster as possible).
    Reply

Log in

Don't have an account? Sign up now