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I've AMD Athlon II processors based server and it does not change frequency on all logical cores under CentOS version 5.5 or RHEL Linux. How do I fix this problem?
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Upgrade FreeBSD 7.x to 7.2 Stable Release

I tried a binary upgrade method, but it failed due to custom kernel installed on my FreeBSD 7.1_p5 64 bit AMD systems. How do I upgrade my FreeBSD server using source code method?
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Q. I’m using CentOS Linux. I only have one processor (AMD 170 CPU) in my system, why does top command output report two processors?

A. You have a DUAL core CPU. A dual-core CPU combines two independent processors and their respective caches and cache controllers onto a single silicon chip, or integrated circuit. Some Intel P4 system comes with hyperthreading (HT) built into it.

This is not an error, it is a normal result of the hyperthreading and dual core CPU technology. This will improve system performance and will not harm any way to your server.

Various dual-core CPUs are being developed by companies such as Motorola, Intel and AMD. Following is the diagram of an Intel Core 2 dual core processor, with CPU-local Level 1 caches, and a shared, on-die Level 2 cache:
Why does top command shows two CPU when I have only one processor?
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