Delay measurement method and device

A delay measurement device, comprising:

• a first physical port comprising:
• a first physical layer chip configured to:
• receive a packet;
• and
• send a first time stamp and the packet, wherein a value of the first time stamp is a time point at which the packet reaches the first physical layer chip;
• and
• a first Media Access Control (MAC) chip coupled to the first physical layer chip and configured to:
• receive the first time stamp and the packet;
• add the first time stamp to the packet;
• and
• send the packet;
• a second physical port coupled to the first physical port and comprising:
• a second physical layer chip;
• and
• a second MAC chip coupled to the second physical layer chip and configured to:
• receive the packet;
• extract the first time stamp of the packet;
• send the packet to the second physical leer chip,
• wherein the second physical layer chip is configured to:
• receive the packet;
• and
• send a second time stamp to the second MAC chip, wherein a value of the second time stamp is a time point at which the packet reaches the second physical layer chip, and
• wherein the second MAC chip is further configured to receive the second time stamp from the second physical layer chip;
• and
• a processor coupled to the first physical port and the second physical port and configured to obtain a processing delay for the packet by subtracting the first time stamp from the second time stamp.