Latest: Time - Raspberry School 3 Review
On February 2, 2015, this originally ordinary day has become different because of the release of the Raspberry Part 2. This day, for the world's enthusiasts of open source hardware DIY, it is a long-lost feast, and the Raspberry Part has finally ushered in a revolutionary upgrade.
Tip: For friends who don't know about the Raspberry Party, you can click on the Raspberry Pivoting Articles under the next.
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The love board also got the Raspberry Pivot 2 (as shown below), and the board is supplied by the E-listed. However, the Raspberry Part 2, which is the most speechless, is actually equipped with a 132-page instruction document, some incredible, of course, can also see the fire of the Raspberry Pist from the middle. After a while, the author now comes to share some of the important features of the Raspberry School 2.
Before the Raspberry Part 2, the Raspberry Party B + is the latest generation of products that have been released before, and is also the most refined and most accurate product of the most refined and most performance of the pasture. What is the result if comparing the Raspberry Part 2 with B +? We will follow the appearance, function, and performance.
Raspberry 2 appearance
First, from the appearance, the Raspberry Piece 2 and Raspberry Parts have almost no differences (of course, there is no use of slight change in the layout of the relatively real circuit), as shown below
From the above figure, we can see the two significant changes in the Raspberry Part 2 to:
Basberry 2 adopted BoTong BCM2836 SOC package larger (four Cortex-A7)
The memory particles are independent from the original BCM2825 SOC, adding a 1GB of Rolida memory particles on the back of the board.
The layout adjustment of the MicroSB interface power supply circuit, the iconic logo of the Raspberry Party becomes smaller (if these is also calculated)
Raspberry 2 function, performance
In terms of function, the Raspberry Part 2 is completely compatible with B +, and even, the Raspberry Part 2 has a surprise function, you can support Window10 and Snappy Ubuntu Core, but the system image has not been released, this still needs to be awaited. time.
However, in performance, the Raspberry Part 2 has a quality leap compared to B +, whether it is the processor or memory, the main changes in hardware are shown in the following table.
The revolutionary upgrade of the processor and the memory has greatly enhanced the performance of the Raspberry 2:
The processor is upgraded from the original Broadcom BCM2835 SOC to BCM2836 SOC (mainly 4-core CORTEX-A7, which is upgraded from 700MHz frequency single core ARM11 to 900MHz.)
Memory is upgraded from 512MB to 1GB (the board in the hand of the author uses the memory particles of Brista)
Raspberry Part 2 hardware upgrades can be said to be a long time, which will also focus on the improvement of Raspberry 2 hardware performance. What kind of feelings will bring to actual experience.
Raspberry Part 2 BCM2836 SOC
Before using the Raspberry Part 2, the author once thoughtfully understood the SOC BCM2836 of this blog. After all, it was an estere from the Raspberry School 2 upgrade. What would there be a special place?
The idea is beautiful, but the reality is cruel! It has to be preded here, even if it is the SOC BCM2835 on the incense Raspberry Party, there is no complete DataSheet (you know, this useful hardware document should make other operating systems to be transplanted to the Raspberry Pie It is easier to make the open source more thoroughly), so don't mention the latest SOC of BCM2836, we know that only processors are upgraded from 700MHz single core ARM11 to -. 1882.900MHz 4 core Cortex -A7, this is a concept?
If you know the engineer of the ARM's product line, it is not stranger for these processors. ARM11 is a classic processor in early ARM, which will be applied in industrial control, high reliability, and real-time embedded applications; Cortex-A7 is the latest high-efficiency-efficient processor ARM, is currently a mainstream application processor, even in today's smartphones, the tablet is also widely used, is a guaranteed performance At the same time, it provides excellent low-power processors, and the huge difference between Cortex-A7 and ARM11 is to differ in nature, as shown below.
The ARM11 is an ARMV6 architecture, and Cortex-A7 is based on ARMV7-A architecture, both from performance, or function, and far exceeds ARM11. So what are the specific improvements in this BCM2836 SOC on the Raspberry 2?
Architecture upgrade: armv6 -. 1882.Armv7-a
Add: 1 arm11 -. 1882.4 Cortex-A7
Processor's frequency increase: 700MHz -. 1882.900MHz
At this way, the Raspberry Piece 2 is not over, it is not a revolutionary upgrade, as for the actual experience performance? Let's look down.
Raspberry Part 2
Raspberry 2 preparations before use and specific method of operating methods can refer to Raspberry Pi to quickly pick up tutorial, this is no longer awkward.
However, it is necessary to remind everyone that because the Raspberry Pieces use a new ARMV7-A architecture, the system core changes, we need to choose the latest system mirror file download of the Raspberry Pist, which can be obtained by accessing the official community of the Raspberry, as follows picture.
Of course, if you have an old version of the Raspberry Pist and install the Raspbian system, you can also upgrade to the latest system version by performing the following command on the old version of the Raspberry. This can also be applied to the Raspberry Part 2 At the same time, it also saves the trouble of re-downloading system image.
Sudo Apt-Get Update
Sudo Apt-Get Upgrade (this upgrade may be very slow, no patience or re-download system image upgrade)
After getting the system of the barberry 2, you can use it. The first time the most intuitive feeling is fast, and the login command from power-up to the login is about 17 seconds. In addition, when switching to the working environment of the graphical interface, the browsing webpage does not have the kind of card, still very smooth, as shown in the picture below, the home page of the pair of pauses is the highest in 30 % Or less, there is more exciting.
From the subjective experience, the performance of the Raspberry 2 has been greatly improved, far from the trending of the Raspberry Pist, but for more accurate understanding of the performance of the Raspberry 2, the author will put the Raspberry Pieces 2 and B + Different contrast tests, the test content includes the performance test of the CPU, the boot speed comparison, the speed comparison of the open program.
Raspberry Part 2 with Raspberry B + Performance Comparative Test
The system of comparative tests selected the latest version of the Raspian system of the Raspberry Pethers, and the Test Tools Select Sysbench, Memtester.
Sysbench
Firstly, the Open Source Multithreaded Performance Test Tool Sysbench can maximize the limit performance of the CPU maximum, and the test content is used to calculate the time used in 0 to 20,000.
Install sysbench command: sudo apt-get install sysbench
Test Results of Raspberry Part 2:
Raspberry Part B + test results:
The Raspberry Part 2 has been tested for only 195 seconds, while the Raspberry Party B + has used nearly 1321 seconds, which means that more than 19 minutes more than the Raspberry Pieces, the author can only sigh. The processing speed is no longer on the same level.
MEMTESTER
MEMTESTER is a memory pressure test tool, which was originally used for a given memory to test memory errors, feedback results. Here the author adds a timing function to see the performance of the CPU by testing the time used for a given 256MB memory size.
Install MEMTESTER command: sudo apt-get install MEMTESTER
Installation Timing Delivery: sudo apt-get install time
Test Results of Raspberry Part 2:
Raspberry Part B + test results:
Raspberry 2 has been used in 1381 seconds, while B + spent 3401 seconds, and more than 33 minutes.
There is also a more interesting thing here, although the 256MB memory test area is set, but the actual test B + we get the available memory only 244MB, so it can also be seen that the last generation of the bouquerry memory resource is shortage.
It is basically no longer available to what performance compares. The performance test can be said to be a situation in which the Raspberry 2 is reversed. Finally, the author also combines the actuality, compares the speed of some combo procedures of the Raspberry Part 2 and B + open the system, as shown in the following table:
summary
Whether it is data-based performance test, or the actual experience of the actual experience, we have to sigh, compared to the Raspberry Party B +, the performance advantage of Raspberry Paving 2 is obvious. It is raasant that the Raspberry Pavilion 2 remains the same price as B +. At present, the Raspberry Part 2 has been fully launched in the panel network mall, and it is interested in missed it.
Reference
Raspberry 2 Mall Buying Links
e 电子 电 树 派
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Original declaration: This article is originally created by the panel network, declined!
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