why not use oprofile to see where the kernel cycles are going?
Sure beats guessing...

>>>-----Original Message-----
>>>From: Arun Singh [mailto:Arun.Singh@(protected)]
>>>Sent: Thursday, November 16, 2006 10:16 AM
>>>To: suse-oracle@(protected)
>>>Subject: Re: AW: [suse-oracle] CPU utilization on system level
>>>
>>>This is ext3 as already mentioned in the thread by Andrew:
>>>
>>>I'm using IBM ds400 fc disk system. Filesystem io options
>>>set to "async", ext3. listener.log looks fine.
>>>
>>><frank.westheider@(protected):
>>>> Hi !
>>>>
>>>> If you can't use directio..are you using the
>>>reiserfs-mountoption "notail" ?
>>>> That's the reason for the hanging processes with direct-io....
>>>>
>>>> Bye
>>>>   Frank
>>>>
>>>> -----Ursprüngliche Nachricht-----
>>>> Von: Andrew Edunov [mailto:and@(protected)]
>>>> Gesendet: Donnerstag, 16. November 2006 15:32
>>>> An: 'Kostya Alexandrov'; 'Fabrizio Magni'
>>>> Cc: suse-oracle@(protected)
>>>> Betreff: RE: [suse-oracle] CPU utilization on system level
>>>>
>>>> Thanks for advice.....
>>>>
>>>> I have some problem with direct io, oracle hangs after turn this
>>>> parameter on.
>>>> It's no possible to move to x86_64 because of hardware(IBM x365).
>>>>
>>>>
>>>>> Dear, Anrew,
>>>>>
>>>>> I think, so problems possible for 20 connections/minute.
>>>>> each dedicated connection is fork(), so sys time cpu utilization
>>>>> possible, but I think so not so much.
>>>>> Also, possible that problems in linux cache, i'm strongly
>>>recommend
>>>>> you to setup support of direct IO.
>>>>> And if you really want to use all of 32G of ram, setup
>>>x86_64 version
>>>>> of oracle and linux.
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>>

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