Topology aware scheduling algorithm.

Jeff Roberson jroberson at
Tue Feb 26 07:49:24 UTC 2008

On Tue, 26 Feb 2008, David Xu wrote:

> Jeff Roberson wrote:
>> I think our identcpu.c already detects this information.  That's what I'm 
>> using.  Although I assume that all cpus are identical and fall back on a 
>> flat topology if this isn't the case.  I'd like to start including more 
>> cache information though.
>> Jeff
> The patch does not assume all cpus are identical, in theory, one can have a 
> machine with one cpu is 4-core and another is 2-core cpu.
> only one place needs to be fixed in the patch,the global variable
> cpu_feature, which is easy to fix for the patch.

                         cpuid_count(4, cache_level, regs);
 			if ((regs[0] & 0x1f) == 0)
 			threads_per_cache = ((regs[0] & 0x3ffc000) >> 14) + 1;

Does this work on all intel/amd cpus?

> David Xu
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