METHOD FOR CONTROLLING TRANSMISSION SPEED OF MULTI-CAST PACKETS

• US 20120147781A1
• Filed: 12/09/2010
• Published: 06/14/2012
• Est. Priority Date: 12/09/2010
• Status: Active Grant

• Current Assignee: Zhigu Holdings Limited
• Original Assignee: Inventec Corporation
• Inventors: Chen, Chih Feng, Li, Lian Cheng
• Granted Patent: US 8,379,643 B2
• Time in Patent Office: Days
• US Class Current: 370/253
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 43/0858 One way delays

Abstract

A transmission speed controlling method for multi-cast packets includes the steps of calculating a standard time, and recording an accumulated error time; transmitting one of the multi-cast packets, and calculating a transmission time of the transmitted multi-cast packet; calculating a difference between the standard time and the transmission time, recording the difference as a current error time, adding the accumulated error time and the current error time, and recording the add result as a preset sleep time; and performing the following steps when the preset sleep time is greater than an error threshold value, wherein the following steps are sleeping for the preset sleep time; being awaked from sleep, and calculating a practical sleep time; calculating a new accumulated error time by subtracting the practical sleep time from the preset sleep time; and returning to the first step to transmit the next one of the multi-cast packets.

Claims

1. A method for controlling transmission speed of multi-cast packets, used for enabling a network interface card (NIC) to transmit a plurality of multi-cast packets at a target speed, and the method for controlling the transmission speed of the multi-cast packets comprises:

calculating a standard time according to sizes of the multi-cast packets and the target speed, and recording an accumulated error time;

transmitting one of the multi-cast packets, and calculating a transmission time of the transmitted multi-cast packet;

calculating a difference between the standard time and the transmission time, recording the difference between the standard time and the transmission time as a current error time, adding the accumulated error time and the current error time, and recording the add result as a preset sleep time; and

when the preset sleep time is greater than an error threshold value, performing following steps;

sleeping for the preset sleep time;

being waked from sleep, and calculating a practical sleep time;

calculating a difference between the preset sleep time and the practical sleep time, and using the difference between the preset sleep time and the practical sleep time as the new accumulated error time; and

returning to the step of calculating the standard time according to the sizes of the multi-cast packets and the target speed, and recording the accumulated error time, so as to transmit the next one of the multi-cast packets.

2. The method for controlling the transmission speed of the multi-cast packets according to claim 1, wherein the step of calculating a standard time according to the sizes of the multi-cast packets and the target speed, and recording the accumulated error time further comprises:

establishing an accumulated transmission time; and

before the step of transmitting one of the multi-cast packets, and calculating the transmission time of the transmitted multi-cast packet, the processing method of the multi-cast packets further comprises;

calculating the accumulated transmission time;

and resetting the accumulated error time and the accumulated transmission time to zero when the accumulated transmission time is greater than an accumulated time threshold value.

3. The method for controlling the transmission speed of the multi-cast packets according to claim 2, wherein the accumulated time threshold value is 1 s.

4. The method for controlling the transmission speed of the multi-cast packets according to claim 1, wherein the error threshold value is 1 ms.

5. The method for controlling the transmission speed of the multi-cast packets according to claim 1, further comprising:

using the preset sleep time as the new accumulated error time when the preset sleep time is not greater than the error threshold value.

6. The method for controlling the transmission speed of the multi-cast packets according to claim 1, wherein the transmission time is obtained by subtracting a system time before the multi-cast packet is transmitted from the system time after the multi-cast packet is transmitted.

7. The method for controlling the transmission speed of the multi-cast packets according to claim 1, wherein the practical sleep time is greater than 10 ms.