Patent ID: 9641446
Date: 2017-05-02
CPC Classifications: H04L

Claim:
1. A control method by an information processing system including a computer, a first switch device, and a second switch device, the first switch device being coupled to a path and the second switch device being coupled to the computer, the control method comprising: detecting, by the first switch device, a decrease of a transmission rate of the path, the decrease of the transmission rate being caused by a decrease of output capacity from the first switch device to the path; transmitting, from the first switch device to the second switch device, degeneration information designating the path and the transmission rate of the path, the degeneration information including a decreasing ratio of the transmission rate, a degeneration position, which is a position of the path in which the transmission rate is decreased, and a notification address, which is an address of the first switch device that notifies the degeneration position; storing, in the second switch device, the degeneration information; determining, by the computer, whether a plurality of packets are to pass through the path in which the transmission rate is decreased, based on the degeneration information stored in the second switch device before the plurality of packets are transmitted from the computer; determining, by the computer, a length of a gap based on the transmission rate of the path when it is determined that the plurality of packets are to pass through the path; transmitting, by the computer, the plurality of packets with a transmission interval determined based on the determined length of the gap; determining whether the degeneration information is transmitted to the second switch device by the first switch device when the received packet is determined to pass through the degeneration position included in the degeneration information; determining that the degeneration information is not transmitted to the second switch device when the address of the computer that is a transmission source of the received packet indicates a path other than the path between the notification address and the degeneration position included in the degeneration information; storing new degeneration information, which includes an address of a transmission destination of the degeneration information, the decreasing ratio in the transmission rate, and the degeneration position in a second memory included in the second switch device; and transmitting the new degeneration information to the computer that is the transmission source based on the address of the computer which is the transmission source.