Excessive Interrupts?

[Drew Tomlinson]

I have FreeBSD 6.0-RELEASE installed on dual P3-600 system with 768 MB 
of RAM.  The system seems sluggish but loads are not high.  I uses 
'systat' in 'vmstat' mode and noticed what might be a lot of 
interrupts.  Here is the output:

    2 users    Load  0.02  0.04  0.02                  Apr 14 12:58

Mem:KB    REAL            VIRTUAL                     VN PAGER  SWAP PAGER
        Tot   Share      Tot    Share    Free         in  out     in  out
Act  146632    8224   363656    17868   33356 count                
All  759448   38200 17236656    78764         pages
                                                          zfod   Interrupts
Proc:r  p  d  s  w    Csw  Trp  Sys  Int  Sof  Flt        cow    4005 total
           4101       407    4   61  156    3      159624 wire        3: 
sio1
                                                   178376 act         4: 
sio0
 0.2%Sys   0.0%Intr  0.1%User  0.0%Nice 99.7%Idl   391908 inact       6: 
fdc0
|    |    |    |    |    |    |    |    |    |      32036 cache       
14: ata
                                                     1320 free        
15: ata
                                                          daefr       
16: fwo
Namei         Name-cache    Dir-cache                     prcfr       
17: isp
    Calls     hits    %     hits    %                     react     1 
18: ahc
       23       19   83                                   pdwak       
19: fxp
                                                          pdpgs  2002 
cpu0: time
Disks   ad0   ad1   da0   da1   da2   da3   sa0           intrn  2002 
cpu1: time
KB/t   0.00  0.00  6.67  0.00  0.00  0.00  0.00     87680 buf
tps       0     0     1     0     0     0     0        19 dirtybuf
MB/s   0.00  0.00  0.00  0.00  0.00  0.00  0.00     53807 desiredvnodes
% busy    0     0     0     0     0     0     0     17984 numvnodes
Showing vmstat, refresh every 5 seconds.            10797

I watched it for a while and the cpus are always around 2000 each.  Is 
this high?  I Googled but did not find any info on what is considered 
excessive.  Does anyone see anything of concern?

Thanks,

Drew

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