Date: Mon, 25 Feb 2008 21:51:01 -1000 (HST) From: Jeff Roberson <jroberson@chesapeake.net> To: David Xu <davidxu@freebsd.org> Cc: current@freebsd.org Subject: Re: Topology aware scheduling algorithm. Message-ID: <20080225215035.Q920@desktop> In-Reply-To: <47C3B943.8020407@freebsd.org> References: <20080225161855.M920@desktop> <47C37CAC.90806@freebsd.org> <20080225195402.M920@desktop> <47C3B943.8020407@freebsd.org>
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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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