Re: Topology aware scheduling algorithm.
- From: Suleiman Souhlal <ssouhlal@xxxxxxxxxxx>
- Date: Tue, 26 Feb 2008 01:47:21 -0800
On Feb 25, 2008, at 11:51 PM, Jeff Roberson wrote:
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?
That won't work on AMD, as they don't support cpuid 4, as far as I know.
-- Suleiman
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- From: Jeff Roberson
- Re: Topology aware scheduling algorithm.
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- Re: Topology aware scheduling algorithm.
- From: Jeff Roberson
- Re: Topology aware scheduling algorithm.
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- Re: Topology aware scheduling algorithm.
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