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Date: Mon, 29 Nov 2010 12:50:25 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Ben Hutchings <benh@...ian.org> Cc: Frede_Feuerstein@....net, Ingo Molnar <mingo@...e.hu>, 603229@...s.debian.org, LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org> Subject: Re: Scheduler grouping failure; division by zero in select_task_rq_fair On Sun, 2010-11-28 at 20:14 +0000, Ben Hutchings wrote: > [ 0.856002] Pid: 2, comm: kthreadd Not tainted 2.6.32-5-amd64 #1 W1100z/2100z What's in that kernel? is that simply the latest .32-stable? > [ 0.536554] CPU0 attaching sched-domain: > [ 0.540004] domain 0: span 0-1 level MC > [ 0.548002] groups: 0 1 > [ 0.560003] domain 1: span 0-3 level NODE > [ 0.568002] groups: > [ 0.574179] ERROR: domain->cpu_power not set > [ 0.576002] > [ 0.580002] ERROR: groups don't span domain->span > [ 0.584004] CPU1 attaching sched-domain: > [ 0.588007] domain 0: span 0-1 level MC > [ 0.596002] groups: 1 0 (cpu_power = 1023) > [ 0.612002] ERROR: parent span is not a superset of domain->span > [ 0.616003] domain 1: span 1-3 level CPU > [ 0.624002] groups: 1 (cpu_power = 2048) 2-3 (cpu_power = 2048) > [ 0.644003] domain 2: span 0-3 level NODE > [ 0.652004] groups: 1-3 (cpu_power = 4096) > [ 0.668002] ERROR: domain->cpu_power not set > [ 0.672002] > [ 0.676002] ERROR: groups don't span domain->span > [ 0.680004] CPU2 attaching sched-domain: > [ 0.684003] domain 0: span 2-3 level MC > [ 0.692003] groups: 2 3 > [ 0.704003] domain 1: span 1-3 level CPU > [ 0.712003] groups: 2-3 (cpu_power = 2048) 1 (cpu_power = 2048) > [ 0.736003] domain 2: span 0-3 level NODE > [ 0.744003] groups: 1-3 (cpu_power = 4096) > [ 0.760003] ERROR: domain->cpu_power not set > [ 0.764003] > [ 0.768003] ERROR: groups don't span domain->span > [ 0.772004] CPU3 attaching sched-domain: > [ 0.776003] domain 0: span 2-3 level MC > [ 0.784003] groups: 3 2 > [ 0.794183] domain 1: span 1-3 level CPU > [ 0.800003] groups: 2-3 (cpu_power = 2048) 1 (cpu_power = 2048) > [ 0.822183] domain 2: span 0-3 level NODE > [ 0.828003] groups: 1-3 (cpu_power = 4096) > [ 0.842180] ERROR: domain->cpu_power not set > [ 0.844003] > [ 0.848003] ERROR: groups don't span domain->span Hrm that smells like the architecture topology setup is wrecked, looks like the NUMA setup is bonkers. I really know very little about that code, I think Tejun recently poked at that in an attempt to merge 32 and 64bit x86. Also, its very weird CPU0 only gets to have 2 domains, while the other 3 get 3 domains.. Ingo, who knows this stuff? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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