From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Ion Badulescu <ionut@badula.org>, linux-kernel@vger.kernel.org
Subject: Re: rcu stalls and soft lockups with recent kernels
Date: Fri, 18 Mar 2016 03:28:57 +0100 [thread overview]
Message-ID: <1458268137.3859.5.camel@gmail.com> (raw)
In-Reply-To: <56E9868E.4000006@badula.org>
On Wed, 2016-03-16 at 12:15 -0400, Ion Badulescu wrote:
> Just following up to my own email:
>
> It turns out that we can eliminate the RCU stalls by changing from
> CONFIG_RCU_NOCB_CPU_ALL to CONFIG_RCU_NOCB_CPU_NONE. Letting each cpu
> handle its own RCU callbacks completely fixes the problems for us.
>
> Now, CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU_ALL is the default config
> for fedora and rhel7. Ho-humm...
All RCU offloaded to CPU0 of a big box seems like a very bad idea.
-Mike
next prev parent reply other threads:[~2016-03-18 2:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <56B39F0C.7070406@badula.org>
2016-02-04 19:12 ` rcu stalls and soft lockups with recent kernels Ion Badulescu
2016-03-16 16:15 ` Ion Badulescu
2016-03-18 2:28 ` Mike Galbraith [this message]
2016-03-22 20:22 ` Ion Badulescu
2016-03-23 4:50 ` Mike Galbraith
2016-03-23 15:36 ` Paul E. McKenney
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