Change the hard disk, change the network card, change the network cable, finally found that the computer room in the router set the bandwidth limit speed.

The following is the 3 machine in the same time period of network bandwidth usage, from the following three figures can be seen, machine a bandwidth usage is very unstable, suddenly high and low, the bandwidth used in the previous second 1M, the next second may reach 20M, machine B and machine C bandwidth usage is obviously more stable, first look at the following:

Machine-A

Machine-B

Machine-C

About machine A This situation, I started to think hard disk problems, hard disk for two years, there may be some bad way, affecting the reading speed, resulting in bandwidth instability.

Then add a hard disk to the machine, and then transfer the main read files to the new hard disk, and then the test found no change, the problem persists.

Later thought, may be the NIC has a problem, and changed the network card, re-installed network card driver, the problem is still in, and changed the network cable, or not.

This morning, inadvertently ping a bit, found that there will be lost packets, the packet is not very serious, in 3% or so, there may have been lost before, but I did not go to test ping, encountered such a problem, contacted a room, the computer room after inspection, said before this machine bandwidth occupied too high, On the router to limit the speed, and then they canceled the bandwidth limit, everything is back to normal, Ping does not lose packets, bandwidth usage is not high and low.

These two days is really depressed, add hard disk, and change network card, network cable, finally found the reason: the computer room in the router set the bandwidth limit speed.

Hope to meet this kind of problem friend, think more about possible reasons, less detours.

Change the hard disk, change the network card, change the network cable, finally found that the computer room in the router set the bandwidth limit speed.