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Date: Mon, 25 Feb 2008 21:51:01 -1000 (HST)
From: Jeff Roberson <jroberson@chesapeake.net>
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To: David Xu <davidxu@freebsd.org>
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Cc: current@freebsd.org
Subject: Re: Topology aware scheduling algorithm.
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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)
 				break;
 			threads_per_cache = ((regs[0] & 0x3ffc000) >> 14) + 1;

Does this work on all intel/amd cpus?

Thanks,
Jeff
>
> David Xu
>
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