*ix systems in general, spend a higher proportion of time in "supervisor state" 
than z/OS. 
This is not a bad thing. The beans are merely counted  differently.
Much of what z/OS and is predecessors manage to charge back to a specific user 
is not done in *ix.
CMG probably has some good reference materiel in the archives. Cheryl Watson 
would also have some good info.

ISTR some old numbers (without attribution) of +/- 50% supervisor state for *ix 
systems and +/- 10% for z/OS and predecessors.**

**These numbers are about 10 years old may no longer be accurate.

<snip>
>On 5/14/2014 7:23 AM, Klein, Kenneth E wrote:
>> What is the general opinion out there on what portion of CPU cycles should 
>> be spent in supervisor state?
>> Is more than 50% a "bad thing"?
>
>I can't imagine >50% is either good or bad. It is what it is; entirely 
>dependent on the nature of the programs you are running at any given time.
> 
It may also depend on the OS.  I suspect Linux spends a smaller portion in 
supervisor state than z/OS.
</snip>

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