XP Pro and Dual processor feature - ntkrnlmp.exe

  • Thread starter Thread starter MadBirdCZ
  • Start date Start date
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MadBirdCZ

Before I go out and try to search answer somewhere else I will try it here.

I just installed an older dual CPU system. After installation, everything
was OK. Both CPUs were visible and identified in device manager and also in
task manager separate graphs were shown for each CPU. However, after some
time one of the CPUs vanished from the task manager but both are still shown
in device management console. I did some checking and it looks like that
windows replaced the ntoskrnl.exe with a single-cpu version of it, or one
that acording to its internal filename should be a MP one but does not
really work like that. When I log in from the recovery console and replace
the "new" ntoskrnl.exe with the ntkrnlmp.exe that comes on the XP Pro SP1 CD
and reboot, both CPUs are shown in task manager again and are also used. But
after few days the situation reverts to this state with no remarks in event
logs etc.

Could really use some info about this one (also the same thing happened on a
different system so it has to be something more than just a random anomaly
related to an old P2 MP system because the other system is a P4 HT machine
which had exactly the same symptoms)

Thanks in advance for any information,
Zdenek Cizek
 
MadBirdCZ said:
Before I go out and try to search answer somewhere else I will try it
here.

I just installed an older dual CPU system. After installation,
everything was OK. Both CPUs were visible and identified in device
manager and also in task manager separate graphs were shown for each
CPU. However, after some time one of the CPUs vanished from the task
manager but both are still shown in device management console. I did
some checking and it looks like that windows replaced the
ntoskrnl.exe with a single-cpu version of it, or one that acording to
its internal filename should be a MP one but does not really work
like that. When I log in from the recovery console and replace the
"new" ntoskrnl.exe with the ntkrnlmp.exe that comes on the XP Pro SP1
CD and reboot, both CPUs are shown in task manager again and are also
used. But after few days the situation reverts to this state with no
remarks in event logs etc.

Could really use some info about this one (also the same thing
happened on a different system so it has to be something more than
just a random anomaly related to an old P2 MP system because the
other system is a P4 HT machine which had exactly the same symptoms)

Thanks in advance for any information,
Zdenek Cizek
Click to expand...

Are you sure that it isn't simply the view in Task manager that is changing?
In TM, select View/CPU History and click One graph per CPU.

--
Ronnie Vernon
Microsoft MVP
Windows Shell/User

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