The following demonstrates intrtime, a DTrace based script for
Solaris 10 that reports on interrupt thread times.

Here we run intrtime on an idle Solaris 10 x86 system,

   # intrtime 
      Interrupt         Time(ns)   %Time
      uhci_intr            55951    0.01
       gld_intr          1132207    0.11
     TOTAL(int)          1188158    0.12
     TOTAL(dur)       1011223771  100.00

A little activity on gld (Generic LAN Driver) and uhci (USB).


Now we run intrtime while running a network copy, moving the mouse, 
and a find command to cause disk activity,

   # intrtime 
      Interrupt         Time(ns)   %Time
      uhci_intr            23753    0.00
       ata_intr          3698089    0.37
     i8042_intr          7360399    0.73
       gld_intr         12319508    1.22
     TOTAL(int)         23401749    2.31
     TOTAL(dur)       1012546207  100.00

i8042 is now busy (mouse), as well as ata (hard disk). We can
also see an increase in gld time for the extra network activity.



The following runs intrtime for 20 seconds,

   # intrtime 20
      Interrupt         Time(ns)   %Time
      uhci_intr          1171415    0.01
       ata_intr         82827769    0.41
     i8042_intr         87803344    0.44
       gld_intr        232256911    1.16
     TOTAL(int)        437781377    2.19
     TOTAL(dur)      20008160160  100.00