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Date: Thu, 24 Jul 2014 06:24:04 +0200 From: Mike Galbraith <umgwanakikbuti@...il.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, oleg@...hat.com, bobby.prani@...il.com Subject: Re: [PATCH tip/core/rcu] Do not keep timekeeping CPU tick running for non-nohz_full= CPUs On Wed, 2014-07-23 at 18:02 +0200, Frederic Weisbecker wrote: > Yes. Distros seem to want to make full dynticks available for users but they > also want the off case (when nohz_full= isn't passed) to keep the lowest overhead > as possible. Yup, zero being the _desired_ number. The general case can't afford any fastpath cycles being added by a fringe feature, we're too fat now. Imagines marketeer highlighting shiny new fringe feature: "...and most network benchmarks show that we only lost a few percent throughput, so you won't have to increase the size of your server farm _too_ much". Ok, so my imagination conjured up a _stupid_ marketeer, you get it ;-) -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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