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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1458268137.3859.5.camel@gmail.com \
--to=umgwanakikbuti@gmail.com \
--cc=ionut@badula.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.