Method for accurately recording time marks of data packages on mainframe system at comuter network terminal
A computer network and host system technology, applied in the field of computer networks, can solve problems such as overestimation of network bandwidth and errors
Inactive Publication Date: 2005-03-30
PHICOMM (SHANGHAI) CO LTD
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If the application process is used to estimate the network bandwidth, for the application process, the real value of the time interval between the arrival of data packets 1 and 2 should be t2-t1, but due to the impact of multi-process concurrency, the time interval becomes is: t4-t3, the application program will mistakenly regard the memory copy rate (packet length of data packet 2 / (t4-t3)) from the system buffer to the user process buffer as the rate at which the data packet arrives from the network, and its direct impact is Overestimating network bandwidth
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[0044] The present invention calls the packet filter in the operating system kernel to obtain the user process data packet time stamp and puts this information into the corresponding time stamp queue of the time stamp access module. After the user process sends or receives a data packet, it must immediately retrieve Get the corresponding timestamp in the timestamp module. attached Figure 4 It is a schematic diagram of the method of using the packet filter to time stamp the network data packets of the user process in the present invention. For each application process that needs accurate time stamps of the network data packets, a time stamp access module is set, which is responsible for the packets of the operating system kernel. The filter interacts to obtain timestamp information for the network packets it captures and stores this information in a timestamp queue, which is returned to the user process as needed. The timestamp access module maintains two timestamp first-in-f...
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The method includes the steps as the follows: 1. setting up filtering conditions for packet filter i.e to set up a time countermark access module for each user process; 2. transmitting or receiving data packet by the user process; 3. catching the data packet received or transmitted by the user process in internal of the system by the packet filter according to the filtering conditions, meanwhile recording time countermark information and to send it to the time countermark access module and 4. taking a time countermark back from the time countermark access module immediately and using it as transmi-receive time countermark of the data packet after a data packet having been received or transmitted by the user process.
Description
technical field [0001] The invention relates to the technical field of computer networks, in particular to a method for accurately marking the time stamp of a data packet by a computer network end host system, especially a method for accurately marking the time stamp of a data packet by an end host system using a multitasking operating system. Background technique [0002] In the computer network system, the fields of network performance measurement and adaptive (Adaptive) network applications require the end system to be able to know the precise time stamp information of the sent and received data packets in order to calculate the performance parameters of the network, such as delay measurement in the field of network measurement, Bandwidth measurement, etc. In these fields, in order to obtain better performance and accurate measurement results, the packet transmission / reception timestamp information obtained by the end system must be very accurate, especially in high-speed...
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IPC IPC(8): G06F9/48
Inventor 王恺黄靖杨峰
Owner PHICOMM (SHANGHAI) CO LTD