linux-kernel - Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes

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Message-ID: <20181022170604.GG3117@worktop.programming.kicks-ass.net>
Date:   Mon, 22 Oct 2018 19:06:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steve Sistare <steven.sistare@...cle.com>
Cc:     mingo@...hat.com, subhra.mazumdar@...cle.com,
        dhaval.giani@...cle.com, rohit.k.jain@...cle.com,
        daniel.m.jordan@...cle.com, pavel.tatashin@...rosoft.com,
        matt@...eblueprint.co.uk, umgwanakikbuti@...il.com,
        riel@...hat.com, jbacik@...com, juri.lelli@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes

On Mon, Oct 22, 2018 at 07:59:40AM -0700, Steve Sistare wrote:
> The STEAL feature causes regressions on hackbench on larger NUMA systems,
> so disable it on systems with more than sched_steal_node_limit nodes
> (default 2).

How come? From a quick read the stealing is per LLC, where do we steal
across nodes?