tuning of CPU usage

[andreas.koenig@xxxxxxxx (Andreas J. Koenig)]

The CPU usage of my LVS director worries me and I'd ask for advice for
tuning parameters. Or any other advice what might be causing the high
CPU usage. ipvsadm shows the number of connections isn't really high
(250 active, 2100 inactive), but vmstat shows system's CPU usage is
>50%. The CPU is a 700MHz Celeron. I'm running DR, kernel 2.4.5-ac8
and I haven't upgraded for a while. Would upgrading improve the
situation?

# ipvsadm -Ln    # IP addresses censored
IP Virtual Server version 0.8.0 (size=131072)                  
Prot LocalAddress:Port Scheduler Flags                         
  -> RemoteAddress:Port             Forward Weight ActiveConn InActConn
TCP  XX.XX.XX.190:443 wrr
  -> XX.XX.XX.181:443               Route   100    0          0         
TCP  XX.XX.XX.190:80 wrr
  -> XX.XX.XX.182:80                Route   7      25         151       
  -> XX.XX.XX.181:80                Route   7      14         153       
  -> XX.XX.XX.180:80                Route   86     208        1836      

# vmstat 3
   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 1  0  1  43496  11256 184536  38580   1   0     1     0  655   100   6  53  41
 0  0  0  43496  11248 184536  38580   0   0     0    63  729   110   1  57  42
 0  0  0  43496  11236 184536  38580   0   0     0     9  685   107   2  56  42
 0  0  1  43496  11232 184536  38580   0   0     0     0  592    97   1  57  42
 0  0  0  43496  11228 184536  38580   0   0     0    16  586   108   1  56  42
 0  0  0  43496  11220 184536  38580   0   0     1     9  705   102   1  56  43
 0  0  0  43496  11208 184536  38580   0   0     0     0  729   104   3  57  41

# uptime
  9:11am  up 40 days, 17:14,  3 users,  load average: 0.00, 0.00, 0.00

Thanks,
-- 
andreas