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I am referring to the Linux top command. If it indicates 10.4% was spent on wa, does that mean 10.4% CPU was available for other processes?

top - 09:40:45 up 178 days, 34 min,  1 user,  load average: 0.32, 0.43, 0.42
Tasks: 173 total,   1 running, 172 sleeping,   0 stopped,   0 zombie
Cpu(s): 1.3%us,  1.1%sy,  0.0%ni, 87.2%id,  10.4%wa,  0.0%hi,  0.0%si,  0.0%st
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migrated from stackoverflow.com Apr 22 '11 at 15:10

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up vote 1 down vote accepted

wa is the time the CPU is waiting for I/O to complete. 87.2%id is the amount of CPU spends in idle, and therefore would be available for other processes.

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