Study Notes

EM64T, Intel Extended Memory 64bit Technology, is extension of 32bit system. This technology makes the OS support up to 16TB memory by adding bit-width for both CPU and memory, while 32bit only supports up to 4GB.

Today’s working is to estimate how much benifit we can get from application 64bit system if upgrade BA880 and all its components.

What does 64bit system mean to developers?By using 64bit platform, the developers can reach better performance when run their programs. Not only this way could encourage the developers to create more powerful applications, but also enable these applications more flexible to adapt in various environments. And the programers even do not need to upgrade their old knowledge if they want to develop in new 64bit platforms.

Larger memory accessing location and 64bit registers provide higher performance on 64bit system. Here, I compare 32bit system and 64bit. As we known, 32bit system’s limit is 4GB memory usage. If there’s a program which is required 3GB memory resource, then it seems the left 1GB(maximum) has to be allocated to OS. Obviously, OS will be slower. The networking server and database server would ofen encouter this problem. And at that time, this 3GB program must need some specical operating to internal code. For example, Physical Addressing Extension, PAE and Address Windowing Extension, AWE, enable 32bit application’s API to access 2GB or higher than 3GB memory space. However, these above special operation have to need more maintenance and resources, even some potential problems.

64bit platform can fix these problems very well. Less code can greatly improve the whole performance. The local bit OS also get benifit from added memory spaces. The all cache, buffer and handler become larger for general applications, and the system could be more stable and reliable. Larger cache and buffer can provide faster data accessing. and support more collateral users.

Register is the fastest memory style which OS can provide. The registers create and keep the results of CPU operating and other computings. 32bit x86 CPU normally has 8 registers, while 64bit x64 processor has 16 registers. There are 128 float-registers 120 general registers in Itanium platform.

As summary, when allocate more memory resource, the performance of register and system can reach higher level they would have never getten in former 32bit environment. 64bit LInux can support file as large as 4EB(2**63).

BX1200 will be released soon except for testing report. The testing engineer has confirmed that the validation is passed, and they will complete the report. Poweron’s Zhang Jianbing told me that Samba, NTP and Http must be required. I need him to confirm some technoical details.

USB3.0, connectors and receptacles will be deeper than the current one, the third major connector of the serial bus standard is set to deliver date transfer speeds of around 4.7Gbps, ten times today’s 480Mbps limit.

Complete writing the step-by-step user guide for BX1200 guide. During the writing, I find some texts are not correct, which are still including NAS880 strings in some tips when mouse is over them.

http://ocw.mit.edu/OcwWeb/web/home/home/index.htm

We have already deployed several virtual machines on 226, and now I want to migrate this virtual servers to new ESX system. After reading some hints found in Internet, mount the Windows(226) share to ESX mount point and then import the files. The first three times I failed to mount the samba share because there is firewall existing on ESX system. When turn off firewall, the mount operation would be succeed.

I have to provide some user-end documents about NAS component, which is considered annoy job. Is that my duty? I don’t think so, I am a developing engineer, not a pure assistant, even who has a good hearing title: Department Interface. When I review the past years, I did not improve myself greatly either in technology or general communication. Even feel very tired sometimes. Pang Rangsheng said my face looked badly at this night. I am worry about my health. I must take good care of my mother, and I can not repeat my father’s way.

To make up for lack of natural talent by hard work.

This afternoon, Gavin told me something about integrating poweron’s software, which is called “pvg” and developed on Fedora5/6. It is used for video monitoring. Shan Xiaoyu and Xi Zhaoxu visited poweron, and later poweron agreed to give their program(binary format) to us for testing. We only need to run the script in the exacted directory. Zhufeng had installed it successfully on CentOS4.4. While in current BX1200 environment, it said that the glib version is too slow to run the program. We fixed this issue by upgrating the kernel from 2.6.21-7 to 2.6.22.15(stable), however, we do not estimated the effection to other components of BX1200, for example, Samba and NFS. The first successful running would create a license key that need to be re-certificated by poweron. Huang Pengcheng sent the first key file to poweron and later got the new key file, while in today testing, it seemed the received file can not be used. I have collectted all relevant information and send feedback to PowerOn.

PowerOn is still worry about how to update their video programs if integrate in our close BX1200. Gavin said we can provide a general interface for uploading as upgrate files in BX1200(Web/http upload).

Till the end of January, I will focus on this testing. The goal we want to reach is estimating whether integrate pvg or not. If integrate it, we also need to estimate the working load.

I borrow a book about documents management from the library, because I think it has became more and more importance during the online system development, the documents are considered to be control point, or middle stones. More attentions would be paid on this subject. I can also use those formats and forms listed in the book.

Collect all hardware information about RD2 department and submit the form to Jack Wang, who is the new storehouse manager. The following days I will study VMware Enterprise Server and try to deploy it to apply in our general working.

Today is the final day of 2007. In the past 2007, I took RHCE exam in January, later resigned from Plasmon and returned to Shenzhen in April. I was married in December 25th. The main work in 2007 is, researching NFSv4 in Plasmon, CentOS4.5/BA880 study, and focusing on ONStor Bobcat 2280 between September and October. In the following days, act as interface of R&D department, who is response of communication with other departments and Inventec guys.

In the coming 2008, I plan to improve my oral English and listening ability in the first three months, and CCNA is also included in my study schedule.

Happy new year, and wish my family well, wish all my friends well.

I’m going to marry Yang Juan in December 25th. This is the most important thing in my 2007. Marriage means many things, grow up and fright as a real man, and have to thing about more deeply. Or I need to change some ways or methods for general communicate, not make others felt be enforced and pressed. Try to speak slowly and become more kindly. Read more book about Chinese culture. Insist on doing hearing exercise everyday. Be a man, protect my home, and all my love.