I have a network issue that has to do with microbursts. I will first tell a bit about the network:
There are 4 Aruba/HP ProCurve switches. 1 Core switch and 3 downstream switches. All connections in this network are 1 Gbit/s connections except the connection to a server. The server is connected to the core switch with 2x 10Gbit/s.
In several locations there are Clients that stream video data from the server. All together 1Gbit/s bandwith in average is enough. Unfortunately, I noticed that there are always drops on the 1Gbit/s downstream connections on the core switch. I thought microbursts could be an issue here and was right. I tested it with wireshark (you can see the I/O graph here: https://www.dropbox.com/s/fcvvqevv32i8wdy/wireshark_D2B607E8-6C5C-41CD-8539-58F35C6A2FFD_20180725140635_a08312.png?dl=0)
The wireshark output was traced on the server. On the first part of the graph where you can see the bursts I mirrored one affected downstream port to the server. The second part (without big bursts) looks different because I stopped mirroring while the trace was running. The problem is that I have no idea how to stop this bursts and the resulting drops. I tried to play a little bit with the settings of the servers network card (buffer size etc.) but I don't have experience with problems like this. What I don't want to do is connecting the server with 1 instead of 10 Gbit/s.
I hope to find some ideas here.