Cat Ning! ! !
Reference link: https: //blog.csdn.net/qq_38880380/article/details/79887704
https://www.cnblogs.com/Flychown/p/6734445.html
bit is the smallest unit of information.
Byte is a unit of computer storage media, 1Byte equal to 8 bit, 1KB = 1024Bytes, 1MB = 1024KB.
Under GBK coding standard Chinese characters is a two Byte, the English letter is 1 Byte.
Computer storage media, such as a U disk, 1GB 1000MB equal to calculate, because of convenience, but the data stored thereon is calculated according to 1024MB equal 1GB.
bps is bits per second, the unit 1bit / s, a data transmission rate
Bps is Byte per second, bytes per second, 1Byte / s is equal to 8bps, i.e. 8bits / s
100M home residential broadband If it is, that is 100Mbps, which is 12.5MBps, 12.5MB / s, the top die, not as big.
On calculates the transmission rate of 1Mbps equal 1000bps, conversion unit 1000, 1024 is not usual. (Remember)
pps is the packet forwarding rate, packet per second, packets per second, packet forwarding rate indicates the ability of the switch is the switch to forward packets, the forwarding decision important indicator of switch backplane bandwidth of the switch, i.e. the switch interface processor and the maximum data throughput between the data bus, the unit is Gbps, the larger the backplane bandwidth, the data processing capability. Backplane bandwidth, transmission rate single port number of ports * 2 *, the full-duplex non-blocking switching mode, the total bandwidth is smaller than the standard value backplane bandwidth devices.
1000M Ethernet transmission rate, 1000Mbps, Gigabit Ethernet, the minimum Ethernet packet can be transmitted is 64bytes, which has a relationship with the length of the Ethernet cable, the farthest two points round trip time is 51.2 microseconds, just send 64bytes , to ensure that the data point a to the time B, data may be obtained from the a B received inform or not, but this time 64Bytes just completely transmitted.
8Bytes preamble size is, the role is to inform the destination device data to come, there is a gap between each frame pack, the minimum is 12Bytes, result in transmission of a packet actually occupied 84Bytes.
Port Gigabit Switch packet forwarding rate, 1000Mbps / (84 * 8) = 1.488Mpps, this is the estimated maximum value, the reality is certainly unattainable, a switch has many ports with full throughput, 1.488Mpps * port number.
RT, response time, the system time request accordingly.
The TPS, the throughput of the system per unit time in the number of processing requests.
Normal use of the user's number of concurrent users, the system can be carried simultaneously.
QPS, the number of queries per second, how much traffic a specific query processing within the server unit time.