top displaying 50% si time and 50% idle on idle machine

Hi,

Kernel 2.6.17.11 with tg3 network driver, NAPI enabled (Distro CentOS 4.4).
top shows strangely 50% idle even if the machine is _completely_ idle.

top - 01:04:30 up 4 days, 12:05,  2 users,  load average: 0.00, 0.00, 0.00
Tasks:  34 total,   2 running,  32 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 50.0% id,  0.0% wa,  0.0% hi, 50.0% si
Mem:   3634452k total,   313284k used,  3321168k free,    71308k buffers
Swap:   505896k total,        0k used,   505896k free,   220272k cached

I find this pretty alarming - can somebody please enlighten me?
Please include me on CC.
Thanks,
M.
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