From: Christopher Lameter <cl@linux.com>
To: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Mike Galbraith <efault@gmx.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Luiz Capitulino <lcapitulino@redhat.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>, Rik van Riel <riel@redhat.com>,
Wanpeng Li <kernellwp@gmail.com>
Subject: Re: [RFC PATCH 0/9] Introduce housekeeping subsystem
Date: Fri, 11 Aug 2017 10:35:19 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1708111033440.2446@nuc-kabylake> (raw)
In-Reply-To: <3ff0c384-dcd9-41e5-c7cc-43c856a4a51e@mellanox.com>
On Fri, 11 Aug 2017, Chris Metcalf wrote:
> > > Maybe a CONFIG_HOUSEKEEPING_BOOT_ONLY as a way to restrict housekeeping
> > > by default to just the boot cpu. In conjunction with NOHZ_FULL_ALL you
> > > would
> > > then get the expected semantics.
> > A big box with only the boot cpu for housekeeping is likely screwed.
>
> Fair point - this kind of configuration would be primarily useful for
> dedicated systems that were running a high-traffic-rate networking
> application on many cores, for example. In this mode you don't end up
> putting a lot of burden on the housekeeping core. In any case,
> probably not worth adding an additional kernel config for.
The standard server config at this point is a two NUMA node with lots of
cores on each. For such a thing a single housekeeping cpu is usually
sufficient. Having a rather large number of NUMA nodes is unusual.
The question is also what is considered a "large" system at this point?
Lots of cores? Lots of NUMA nodes?
Ah, Chris since you are here: What is happening with the dataplane
patches?
next prev parent reply other threads:[~2017-08-11 15:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 13:21 Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 1/9] housekeeping: Move housekeeping related code to its own file Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 2/9] watchdog: Use housekeeping_cpumask() instead of ad-hoc version Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 3/9] housekeeping: Provide a dynamic off-case to housekeeping_any_cpu() Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 4/9] housekeeping: Make housekeeping cpumask private Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 5/9] housekeeping: Use its own static key Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 6/9] housekeeping: Rename is_housekeeping_cpu to housekeeping_cpu Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 7/9] housekeeping: Use own boot option, independant from nohz Frederic Weisbecker
2017-08-11 19:09 ` Luiz Capitulino
2017-08-12 14:10 ` Frederic Weisbecker
2017-08-13 15:13 ` Luiz Capitulino
2017-08-14 17:01 ` Frederic Weisbecker
2017-08-14 17:34 ` Luiz Capitulino
2017-08-14 18:29 ` Mike Galbraith
2017-08-15 13:07 ` Frederic Weisbecker
2017-08-15 15:15 ` Mike Galbraith
2017-08-15 15:30 ` Paul E. McKenney
2017-08-15 15:52 ` Christopher Lameter
2017-08-15 15:57 ` Mike Galbraith
2017-08-15 16:26 ` Christopher Lameter
2017-08-16 18:00 ` Mike Galbraith
2017-08-15 15:53 ` Mike Galbraith
2017-07-21 13:21 ` [RFC PATCH 8/9] housekeeping: Move it under own config, independant from NO_HZ Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 9/9] workqueue: Affine unbound workqueues to housekeeping cpumask Frederic Weisbecker
2017-07-21 19:48 ` [RFC PATCH 0/9] Introduce housekeeping subsystem Chris Metcalf
2017-08-10 12:54 ` Frederic Weisbecker
2017-08-10 13:57 ` Chris Metcalf
2017-08-11 6:36 ` Mike Galbraith
2017-08-11 15:01 ` Frederic Weisbecker
2017-08-11 19:22 ` Luiz Capitulino
2017-08-11 15:08 ` Chris Metcalf
2017-08-11 15:35 ` Christopher Lameter [this message]
2017-08-11 15:50 ` Chris Metcalf
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=alpine.DEB.2.20.1708111033440.2446@nuc-kabylake \
--to=cl@linux.com \
--cc=cmetcalf@mellanox.com \
--cc=efault@gmx.de \
--cc=fweisbec@gmail.com \
--cc=kernellwp@gmail.com \
--cc=lcapitulino@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=riel@redhat.com \
--cc=tglx@linutronix.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®