High interrupt CPU in top...

[Peter Harrison]

Can anyone help me diagnose this please? I'm on 10.0-RELEASE on a Thinkpad
X200s. In top I see around 30% CPU listed as 'interrupt' even when I'm only
running Xorg (with Xfce as the window manager) with no other applications
open:

last pid:  1946;  load averages:  1.09,  1.30,  1.24
                            up 0+00:59:59  21:56:20
54 processes:  1 running, 53 sleeping
CPU:  0.4% user,  0.0% nice,  0.2% system, 32.8% interrupt, 66.6% idle
Mem: 188M Active, 282M Inact, 283M Wired, 22M Cache, 206M Buf, 1127M Free
Swap: 4096M Total, 4096M Free

  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU
COMMAND
 1362 root          1  20    0   150M 25596K select  1   1:18   0.10% Xorg
 1613 peter         4  32    0   260M 21700K select  1   0:02   0.10%
xfce4-terminal
 1521 peter         1  20    0   159M 17652K select  1   0:10   0.00% xfwm4
 1539 peter         1  20    0   152M 13704K select  1   0:08   0.00%
wrapper
 1524 peter         3  20    0   278M 24172K select  1   0:05   0.00%
xfce4-panel
 1444 haldaemon     2  28    0 60428K  6436K select  1   0:01   0.00% hald
 1511 peter         2  39    0   163M 14756K select  1   0:01   0.00%
xfce4-session
 1544 root          2  20    0 54908K  5904K select  1   0:01   0.00%
upowerd
 1526 peter         2  20    0   247M 16108K kqread  0   0:01   0.00%
xfdesktop
 1540 peter         1  20    0   156M 15480K select  1   0:01   0.00%
wrapper
 1279 messagebus    1  20    0 17044K  3144K select  0   0:00   0.00%
dbus-daemon

How do I diagnose what's using my processor?

Thanks in advance.



Peter Harrison.