High interrupt CPU usage in top

[Mark Cullen <mark.r.cullen@xxxxxxxxx>]

I don't know if it is anything to be concerned about, but I seem to be 
seeing high interrupt CPU usage in top (at least) when compiling things...

---
load averages:  0.81,  0.57,  0.36                      up 0+00:37:49 
15:41:44
43 processes:  2 running, 41 sleeping
CPU states: 37.1% user,  0.0% nice, 27.9% system, 35.0% interrupt,  0.0% 
idle
Mem: 24M Active, 293M Inact, 56M Wired, 12M Cache, 51M Buf, 17M Free
Swap: 1024M Total, 1024M Free

  PID USERNAME PRI NICE  SIZE    RES STATE    TIME   WCPU    CPU COMMAND
65573 root     229   0   808K   556K wait     0:00  0.00% 16.80% sh
  781 root     152   0  3704K  3004K select   0:41  8.69%  8.69% cvsup
65863 root     229   0  6048K  5312K RUN      0:00  0.00%  7.37% cc1
59936 root     224   0  2420K  1940K wait     0:00  4.83%  3.91% bmake
  760 mrboo    152   0  5844K  2084K select   0:01  1.95%  1.95% sshd
59990 root     226   0  1524K  1036K wait     0:00  0.18%  0.15% bmake
  790 mrboo    152   0  5844K  2084K select   0:00  0.00%  0.00% sshd
37968 root     226   0  2244K  1772K wait     0:00  0.00%  0.00% bmake
37843 root     184   0  2244K  1772K wait     0:00  0.00%  0.00% bmake
38058 root     218   0  2224K  1748K wait     0:00  0.00%  0.00% bmake
38101 root     159   0  2228K  1760K wait     0:00  0.00%  0.00% bmake
64099 mrboo    152   0  2296K  1284K RUN      0:00  0.00%  0.00% top
21269 mrboo    152   0  5844K  2084K select   0:00  0.00%  0.00% sshd
  788 root     152   0  5888K  2040K sbwait   0:00  0.00%  0.00% sshd
  651 root     152   0  1460K   944K ttyin    0:00  0.00%  0.00% csh
  758 root     152   0  5888K  2040K sbwait   0:00  0.00%  0.00% sshd
---

Pretty minimum system, fresh install, 1.4.4, GENERIC kernel, was 
cvsup'ing the DF source tree and compiling `apcupsd`. Pretty much the 
only thing running other than that is sshd, cron, and syslogd!

I don't recall ever seeing the interrupt usage that high in 4.11, so I 
thought I might ask if it's normal (perhaps it was just broken in 4.11, 
or maybe it's just broken in DF and it's nothing to worry about)