I have a 4 servers connected to a HP 2848 switch with uplink to a router (Linux or Cisco - doesn't matter). Total traffic is about 300Mbps with 60-70Kpps.
The problem is with a a port, connected to a router: per TCP connection speed is not more then 20Mbps. To identify this problem I set up an additional port on router, connected it to the same switch and added a route to it - had no problem.
The switch shows it has multiple discards on port (only the worst cases shown):
# walkmib ifOutDiscards ifOutDiscards.14 = 76,784 ifOutDiscards.29 = 17,475 ifOutDiscards.30 = 250,741 ifOutDiscards.38 = 1,072,440 ifOutDiscards.43 = 2,661,183 ifOutDiscards.44 = 3,110,164
Enabling of qos-passthough-mode didn't help, lacp is disabled, CPU load on the switch is not more then 10% and there is enough memory.
Where might the problem be?