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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Julia Cartwright <julia@ni.com>,
	Luiz Capitulino <lcapitulino@redhat.com>,
	linux-rt-users@vger.kernel.org,
	Josh Triplett <josh@joshtriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rcu: update: make RCU_EXPEDITE_BOOT default
Date: Mon, 7 Nov 2016 18:30:30 +0100	[thread overview]
Message-ID: <20161107173029.caktxw4piluk5atu@linutronix.de> (raw)
In-Reply-To: <20161107121939.7346923f@gandalf.local.home>

On 2016-11-07 12:19:39 [-0500], Steven Rostedt wrote:
> I agree, but if this creates a boot time regression in large machines,
> it may not be warranted.
> 
> I know Linus usually doesn't like options with default y, but this may
> be one of those exceptions. Perhaps we should make it on by default and
> say in the config "if you have a machine with 100s or 1000s of CPUs,
> you may want to disable this".

The default could change if we know where the limit is. I have access to
a box with approx 140 CPUs so I could check there if it is already bad.
But everything above that / in the 1000 range is a different story.

> -- Steve

Sebastian

  reply	other threads:[~2016-11-07 17:30 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20161012162114.GA9362@jcartwri.amer.corp.natinst.com>
     [not found] ` <20161012124956.3cb5f988@redhat.com>
     [not found]   ` <20161012171553.GA18392@jcartwri.amer.corp.natinst.com>
     [not found]     ` <20161012203223.GK29518@linux.vnet.ibm.com>
     [not found]       ` <20161013191332-mutt-send-email-mst@kernel.org>
     [not found]         ` <20161014092050.GW29518@linux.vnet.ibm.com>
     [not found]           ` <20161016044420-mutt-send-email-mst@kernel.org>
     [not found]             ` <20161016112846.GR29518@linux.vnet.ibm.com>
     [not found]               ` <20161031173852.a3ji7hhgjis5l3u4@linutronix.de>
     [not found]                 ` <20161031181543.GN3716@linux.vnet.ibm.com>
2016-11-02 16:30                   ` [PATCH] rcu: update: make RCU_EXPEDITE_BOOT default Sebastian Andrzej Siewior
2016-11-03 16:22                     ` Paul E. McKenney
2016-11-03 16:33                       ` Sebastian Andrzej Siewior
2016-11-03 16:59                         ` Paul E. McKenney
2016-11-07 17:19                           ` Steven Rostedt
2016-11-07 17:30                             ` Sebastian Andrzej Siewior [this message]
2016-11-07 17:35                               ` Josh Triplett
2016-11-07 18:05                                 ` Paul E. McKenney
2016-11-07 18:08                                   ` Josh Triplett
2016-11-07 19:04                                     ` Paul E. McKenney

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