uptime is too high. Is it normal?

["colin" <colin@xxxxxxxxxxxxxx>]

Hi all,
We use MIPS Linux+uClibc0.9.28+busybox 1.1.0 on our machine.
After use "uptime" to get the loading of device, it shows: 
    03:50:05 up  3:50, load average: 2.00, 2.00, 2.00
Is it normal? It seems too high because my PC Linux has a much lower value:
    20:38:31 up 12 days,  5:11,  5 users,  load average: 0.04, 0.01, 0.00

Regards,
Colin