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SMB processor on RH9, I have a dual processors but top suggests that I have 4 processors

Posted on 2005-05-05
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Last Modified: 2013-12-15
I was running a RedHat9 server with a single processor.
I popped in a second processor as the board supported 2
and upgraded the kernel from kernel-2.4.20-8.i686.rpm to
kernel-smp-2.4.20-8.i686.rpm
I adjusted Grub to recognize and boot from the new kernel.
I rebooted the system, ran "top" and now for some reason the server
see's 4 processors listed.
Any idea's?
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Question by:paddyhaig
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by:jlevie
ID: 13941215
Sounds like Pentiums with HT support. Each of those will show up in top as a pair of CPU's.
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by:paddyhaig
ID: 13941466
What can I do about this, and will it cause a problem?
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jlevie earned 1000 total points
ID: 13942633
You don't need to do anything about it and it doesn't cause a problem. In one sense a Pentium CPU with Hyperthreading is something of a dual processor and top is simply taking that into account.
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Expert Comment

by:GSIJoe
ID: 14007104
Well, it depends on the definition of a problem.  In the majority of situations, having Hyperthreading turned on is a good thing.  There are, however, situations where it can apparently slow things down.  For example, if you have a computationally intensive process that takes 1 minute on given processor with hyperthreading turned off, you might be able to get two processes done on the same processor in a minute and half.   Note that the overall throughput has increased, but each individual thread took half again as long.  Should this cause a problem for you, there is usually a BIOS setting you can use to turn of Hyperthreading.
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