CPU WAIT I/O statistic

From: Pablo Rodriguez <p_rodri99_at_yahoo.es>
Date: Thu, 10 Oct 2002 12:15:42 -0800
Message-ID: <F001.004E626C.20021010121542@fatcity.com>

Hi list

   Can anyone explain me what exactly does the WAIT I/O column of the sar -u output mean?

   Does it represent the % of CPU used by the kernel processes to perform I/O?

   As far as I know the waiting processes do no wait actively when they ask for an I/O. right? The OS uses the SLEEP and WAKEUP primitives.

   So, Which process is using this CPU? (The WAIT I/O%)

   Or does this WAIT I/O have to be taken as if the CPU were idle?

Please shed some light on this.
Thanks

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