Linux and HT , whose runnning this combo ?

[jose]

Hi everyone,

I've noticed that on RH9.0 & RH Ent3.0 running on a 845/875 based mobo's that Linux detects the second cpu,

so the smp kernel is installed. Anybody have any issues w/ this ?

Should I put the smp kernel on a production server or use the uni-processor kernel when using a P4HT processor ??

Thanks for the info.

Regards,
Jose

 

[Nothinman]

Linux still treats the HT logical CPU as a physically different CPU, so it may cause cache thrashing and slowdown compared to running without SMP enabled. It really depends on your load and what you're running. If you want to try out UP you can just boot with the 'nosmp' parameter and it'll disable SMP on bootup without the need to have 2 kernels installed.

RH may apply some HT patches to their ENT stuff, I don't know, they do apply a lot of patches and I don't keep track of them. But the only HT aware scheduler patch I know is for 2.6 right now.

 

[Barnaby W. Füi]

The HT patch will theoretically give you a little more performance but I couldn't feel any difference.

 

[jose]

Thanks , I'll just use the uni-proc kernel to avoid any problems.

Regards,
Jose

 

[WarpSpeed]

Mandrake 9.2 recognizes two processors on my IS-7. I don't know if it makes much difference; I haven't tested it with any CPU-intensive tasks.