how to tune the system for the heavy traffic?

[李森]

hi all:
         my freebsd is  7.3-RELEASE FreeBSD.
         i fount it lose packages slightly,

ping test:
23 packets transmitted, 22 packets received, 4.3% packet loss
round-trip min/avg/max/stddev = 0.073/0.521/1.952/0.521 ms

          netstat 1:

       there is a lot of input error in netstat 1 result:

% netstat 1
            input        (Total)           output
   packets  errs      bytes    packets  errs      bytes colls
     27839  3336    1807953      31722     0    6226471     0
     29596  2122    1903013      34289     0    6729220     0
     24747  2251    1600582      17843     0    3094079     0
     15358     0    1004995      15942     0    3810051     0
      4743     0     337459      11260     0    2147868     0
      9534     0     629656       3890     0     411055     0
     15024     0    1019820      22629     0    9454034     0
     25099   191    1654160      22364     0    5319211     0
     13175   358     874315      18197     0    6062716     0
     25506  1785    1651455      33867     0   10503736     0
     33319  3029    2137120      31391     0    6423544     0
     29830   597    1915300      33235     0    6198883     0


    My question is how to tune the system for the heave traffic?