Date: Tue, 13 Nov 2012 16:36:42 -0800
From: Josh Triplett <josh@joshtriplett.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Tim Sander <tim01@vlsi.informatik.tu-darmstadt.de>,
        linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
        mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
        akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
        niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org,
        rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
        edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com,
        sbw@mit.edu, patches@linaro.org
Subject: Re: Does anyone use CONFIG_TINY_PREEMPT_RCU?
Message-ID: <20121114003641.GB7858@jtriplet-mobl1>
References: <20121113004906.GA10557@linux.vnet.ibm.com>
 <201211132122.30259.tim01@vlsi.informatik.tu-darmstadt.de>
 <20121113212034.GD2489@linux.vnet.ibm.com>
 <201211140032.37320.tim01@vlsi.informatik.tu-darmstadt.de>
 <20121114000648.GN2489@linux.vnet.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20121114000648.GN2489@linux.vnet.ibm.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 879
Lines: 22

On Tue, Nov 13, 2012 at 04:06:48PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 14, 2012 at 12:32:36AM +0100, Tim Sander wrote:
> > Hi Paul
> > 
> > Sorry english somehow i tried to shoehorn more than one sentence into one 
> > sentence in the last mail.
> > > OK, how much memory does your device have?
> > It's 128Mb of memory.
> 
> That is a bit on the smaller side.  But still quite large compared
> to the 15K difference between CONFIG_TREE_PREEMPT_RCU and
> CONFIG_TINY_PREEMPT_RCU.

I'd also expect CONFIG_TINY_PREEMPT_RCU to have marginally more
performance on a UP system, but probably not enough to matter.

- Josh Triplett
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/