problems with IRQ

[KES]

system work fine, but systat -v show wrong results in compare with vmstat -i
seems counter overflow or so..

systat -v
    2 users    Load  0.95  1.13  1.15                  Oct  6 17:36

Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
        Tot   Share      Tot    Share    Free           in   out     in   out
Act  342596    6396   813716     9244 1395872  count
All  527128   10356  3002896    39336          pages
Proc:                                                            Interrupts
  r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt     31 cow    254k total
             50      557k 2614  14k 237k 4028  449    127 zfod        atkbd0 1
                                                        2 ozfod    12 ata0 14
 9.1%Sys  21.7%Intr  1.6%User  0.0%Nice 67.6%Idle       1%ozfod  221k ehci0 16
|    |    |    |    |    |    |    |    |    |    |       daefr     2 ehci1 23
=====++++++++++>                                       37 prcfr  4130 cpu0:timer
                                        42 dtbuf      314 totfr 15799 re0 256
Namei     Name-cache   Dir-cache    142271 desvn          react  4131 cpu1:timer
   Calls    hits   %    hits   %     87941 numvn          pdwak  4129 cpu3:timer
    6158    5762  94                 35563 frevn          pdpgs  4130 cpu2:timer
                                                          intrn
Disks   ad0   da0 pass0                            298480 wire
KB/t  18.79  0.00  0.00                            193600 act
tps      12     0     0                           2103500 inact
MB/s   0.22  0.00  0.00                              9180 cache
%busy     0     0     0                           1386692 free


# vmstat -i
interrupt                          total       rate
irq1: atkbd0                        2536          0
irq14: ata0                      8516926          9
irq16: ehci0                  2233740154       2585
irq23: ehci1                     2594742          3
cpu0:timer                    3562265448       4122
irq256: re0                   2291967374       2652
cpu1:timer                    3562481709       4123
cpu3:timer                    3479157511       4026
cpu2:timer                    3555645238       4115
Total                        18696371638      21638

thank you.