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Poor HP Procurve 2848 port performance

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http://serverfault.com – 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 (HowTos)