core2 duo cpu optimizations in fedora kernels?

[Justin Conover]

On 10/18/06, Gianluca Cecchi <gianluca.cecchi at gmail.com> wrote:
>
> hello,
> I would like to post a generic question and a specific one.
>
> 1) I noticed that in EL kernels and also in fedora ones, the cpu
> optimization selection in .config is generic CONFIG_M686 (that should
> be PPro if I'm not wrong). Instead, in huge kernels there is
> CONFIG_MPENTIUMIII set, I think because it was the first with PAE
> capability perhaps?
> Would one benefit getting the kernel.src.rpm package and compiling
> with set up based on his own traget processor? For example
> CONFIG_MPENTIUM4?
> I think after PPro many microarchitecture changes has come...
> Any drawbacks or possible incompatibility with the rest of the system?
>
> 2) If the answer to 1) it's worth while, what kind of optimizations
> could I get for Core2 duo processor based systems, or in the future
> for woodcrest?
> It seems to me that, simply said, core2 duo takes the best from PIII
> and PXeon features, so if you select one of the two you however
> probably miss something....
> Does the gcc version provided with fedora support optimizations for
> these new processors? And in case are these mapped in kernel
> capabilities then?
> Does it make sense to consider intel compiler to compile kernel, as
> for example it supports on Linux the switches -xT or –axT for
> Merom/Conroe/Woodcrest processors?
>
> Otherwise how could we get all the features provided by these new cpus?
>
> thanks in advance.
> Gianluca
>
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Not sure if you will see much of a gain, however if you have a  Core 2 duo,
I would be running x86_64..... ;)

$ cat /proc/cpuinfo |grep "model name"
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
model name      : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz

$ uname -m
x86_64

$ uname -r
2.6.18-1.2798.fc6
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