Lan network performance test method HDtune 64K has a cache speed test method, let you know your network performance, hdtune64k

Source: Internet
Author: User

Lan network performance test method HDtune 64K has a cache speed test method, let you know your network performance, hdtune64k

This method can effectively test the network transmission performance. This method is applicable to disks, diskless (System Virtual Disk), game Virtual Disks, and other virtual disk software with cache functions, however, because each software works in different ways and principles, the test results of each software may not be the same, but it does not matter, based on the test speed, you can associate it with the speed you feel during actual use. Naturally, you will know the relationship between the speed and the speed of the game.

Currently, the data tested in several Internet cafes is:
1. CF is very popular. If a cache speed can reach 60 ~ 61 Mbit/S to enter the game in about 23 seconds. Of course, when the Internet and machine configurations are low. If the speed can reach 70 MB/S, CF can enter the game within 20 s. This speed is related to multiple factors, such as switch, Nic, network cable, and even crystal head, Nic settings, etc, you can share your experience.
2. In the same environment, the cache speed of diskless (System Virtual Disk) disks is generally 4-4 lower than that of game Virtual Disks ~ 5 MB/S. This is because the working principle of diskless (System Virtual Disk) varies, and does not affect the use ~ The performance difference of 5 Mbit/S does not lead to a wide gap in the system startup speed. It is likely that there is no difference.
3. Whether there is a disk, no disk (System Virtual Disk), a game virtual disk, or a client test can reach a speed of 30 Mb/s, neither the game nor the system will experience a card, however, the game's entry speed may not have much advantage.

HDTune speed measurement method:
1. Select the disk partition to test.
2. select random access.
3. Select 64KB block for testing.
4. Click start to perform the test.
5. The initial test is generally the random read performance of the hard disk.

6. If other options remain unchanged, you can click the start button several times to obtain the network transmission performance.

I hope that students with in-depth research plans can focus on learning
The most authoritative ultimate tutorial on Connecting Virtual Disks-ten years of experience with Internet cafes (completed in May 27 !)
Http:// Tid = 58821

If the speed is slow, you can troubleshoot in the following directions:
1. Check whether the server's cache is too small. You can increase the cache size to test the cache size. If you want to test the speed, 2 GB of cache can be tested;
2. If the switch has enabled the traffic control function, you can check whether the switch supports traffic control. If yes, it has been disabled;
3. The speed limiting software is installed on the server or client. Although it is a very idiotic problem, some students have made some restrictions, but I forgot to test the software later. As a result, the speed is slow;
4. An effective speed-up method. to modify the NIC parameters, see the following link:

HDTunePro.rar(754.7 KB, 8,353 times)

My home broadband 2 mb I usually test the network speed of 180 to KB, why I only have a few KB per second?

Real bandwidth of ADSL ~
Users who often use ADSL, do you know the real speed of ADSL? With this question, we will expand the problem step by step.
Many users have reported that the download rate of ADSL does not reach the nominal 512 K. After the network is connected through ADSL, a download speed indicator is displayed during download, the download speed shown above is generally about 50 KByte/s! This is a misunderstanding caused by unclear conversion relationships.
What does 1,512 k adsl mean?
512 K = 512 Kbps = 512 K bits/s = 64 K bytes/s
I think this conversion should be fine.
2. What does 64 K bytes/s mean?
The true meaning of this 64 K is "the maximum download bandwidth that individual users can enjoy exclusively"
So what does this mean? I wonder if anyone has paid attention to the Application Form for installing China Telecom ADSL. The bandwidth projects mentioned above are not higher than kb, and the bandwidth projects are not higher than 8 Mb, that is to say, under normal circumstances, we can have a maximum of 64 KB of proprietary bandwidth. Note that the value is "no higher than". That is to say, in many cases, our private bandwidth may be less than 64 KB. Why?
In fact, China Telecom's ADSL is running on the ATM, and the bandwidth from the ATM to the chinanet edge router is 155 M. Each edge router can connect 3000 users. If these users access the Internet at the same time, in fact, each user only has 50 kbit/s of bandwidth, that is, 7 Kbytes/s. In addition, with the attenuation of the router, the speed of the common modem may end up.
Of course, the above is just a hypothetical situation. After all, it is almost impossible for 3000 people to connect to an edge router at the same time. China Telecom will not allow the router to be connected at full load, making the speed drop so huge.
However, 64 K is undoubtedly the highest private bandwidth.
3. Why does my 512KADSL download speed reach kb or more?
We figured out that 64 K is the maximum private bandwidth, but not equal to the maximum bandwidth. In fact, when dialing ADSL, we have allocated a download bandwidth of approximately 8 Mbps, that is, 1 Mbytes/s, however, China Telecom limits our VPC bandwidth to a maximum of 64 K, so when there are few vro connected users, we can obtain a portion of the shared bandwidth that exceeds the proprietary bandwidth (obviously, telecom does not need to idle the bandwidth ), of course, the K rate of ADSL can never reach the download speed of 1 Mbit/s by occupying the shared bandwidth, because after all, there are still many people surfing the internet at the same time, moreover, China Telecom certainly has some load balancing mechanisms.
4. Influence of ADSL upload speed on download
TCP/IP stipulates that each packet must have a backend message of acknowledge. That is to say, a message reply is required for the transmitted data to determine the transmission speed, and decide whether to re-transmit the lost data.
Part of the upstream bandwidth is used to transmit the acknowledge data. When the upstream load is too high, the transmission speed of acknowledge data will be affected, and the download speed will be affected. This has a particularly significant impact on Asymmetric Digital loops, that is, connections with upstream bandwidth much less than the download bandwidth.
Experiments show that when the upload is full, the download speed is equivalent to 40% of the ideal speed, this explains why many friends get a higher download speed with a slight speed limit when using BT for download.
In this case, we cannot limit the speed of all people, because it is unrealistic and unscientific for ADSL users. The appropriate speed limit is correct.
5. The speed of ADSL gradually decreases as the connection time increases.
As mentioned above, the maximum download bandwidth of 8 Mbps will be set up when ADSL is re-called. This bandwidth will never change! However, in fact, because of the noise detection mechanism of ADSL, if the line is not good, the connection established at the beginning is obviously impossible to reach the theoretical value. It may end with 5 Mbps, and the bandwidth will not change.
So why is the speed of ADSL getting slower and slower?
... The remaining full text>

Teaching Network urgent and urgent

This is the unit problem. Here, the 512 k and the actual traffic of a file 512/8 k can be different. The actual traffic of the k ad is, that is, 64 k/s because the measurement unit of bandwidth and file size is different. when using tools such as bt, it may be larger. As for 10.0 mbps and 100 mbps, it is determined by your Nic and media and it has little to do with ad. o

(1) Conversion between bit (bit)/second (second) and Byte (Byte)/s (second): The line unit is bps, indicating bit (bit) /second (seconds). Note that it is lowercase letter B. When downloading the data online, the unit of speed is usually Byte (bytes)/s (seconds). Note that it is uppercase letter B. The relationship between bytes and Bits is 1 Byte = 8 Bits. In addition, when the IP header and HTTP header increase the transmission volume due to the network transmission protocol, 1 KByte/s download rate is displayed, the actual transmission rate is about 10 kbps. For example, the download speed of 50 KByte/s has reached kbps. Remember to pay attention to the unit !!!
(2) The bandwidth rate applied by the user refers to the maximum theoretical rate technically possible, when a user accesses the Internet, it is also affected by the configuration of the user's computer software and hardware, the location of the website to be browsed, and the bandwidth of the website to the end. Therefore, the rate of the user accessing the internet is usually lower than the theoretical rate.
(3) theoretically: the theoretical rate of 2 M (2 Mb/s) bandwidth is 256KB/s (that is, 2048Kb/s), and the actual rate is about 103 -- 200kB/s; (This is caused by many factors, such as the user's computer performance, network equipment quality, resource usage, network peak periods, website service capabilities, line attenuation, and signal attenuation ). The theoretical bandwidth of 4 M (4 Mb/s) is 200 kb/s, and the actual rate is about --- kb/s.
Broadband Network Speed Calculation Method
Basic knowledge:
In computer science, bit is the smallest unit of information, which is called a binary bit. It is usually represented by 0 and 1. Byte is called a Byte. It consists of eight (8 bit) bytes (1 Byte), used to represent a character in the computer. Bit and Byte can be converted. The conversion relationship is 1 Byte = 8bit (or 1B = 8b, that is, 1bit is abbreviated to 1b (note that it is a lowercase English letter B), and 1Byte is abbreviated to 1B (note that it is a capital English letter B ).
Generally, in a computer network or network operator, the unit of bandwidth rate is expressed in bps (or B/s); bps indicates the number of bits per second (that is, the number of bits transmitted per second, it is the abbreviation of bit per second. In practice, 1 Mbps bandwidth means 1 Mbps (1 MBps for megabits per second instead of 1 Mbps for megabytes ).
We recommend that you remember the following conversion formula:
1B = 8b 1B/s = 8b/s (or 1Bps = 8bps)
1KB = 1024B 1KB/s = 1024B/s
1 MB = 1024KB 1 MB/s = 1024KB/s

Standard tip: in actual writing specifications, B should represent Byte (bytes), and B should represent bit (bit ), however, in actual writing, bit and Byte are both mixed into B, for example, both Mb/s and MB/s are mixed into Mb/s, this leads to errors due to unit confusion in actual computing. Please note !!!

Example: in our actual online applications, when downloading software, we often see the words "128 KBps (KB/s), 103KB/s", and so on, because the ISP's line bandwidth is measured in bits, and the download software usually displays byte (1 byte = 8 bits), the actual value can be obtained through conversion. However, we can convert it according to the conversion formula:
128 kb/s =? (Kb/... the remaining full text>

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