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Date: Fri, 8 Feb 2013 16:53:17 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: Christoph Lameter <cl@...ux.com> Cc: Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Alessio Igor Bogani <abogani@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Chris Metcalf <cmetcalf@...era.com>, Geoff Levand <geoff@...radead.org>, Gilad Ben Yossef <gilad@...yossef.com>, Hakan Akkan <hakanakkan@...il.com>, Ingo Molnar <mingo@...nel.org>, Li Zhong <zhong@...ux.vnet.ibm.com>, Namhyung Kim <namhyung.kim@....com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [ANNOUNCE] 3.8-rc6-nohz4 2013/2/7 Christoph Lameter <cl@...ux.com>: > On Thu, 7 Feb 2013, Frederic Weisbecker wrote: > >> Not with hrtick. > > hrtick? Did we not already try that a couple of years back and it turned > out that the overhead of constantly reprogramming a timer via the PCI bus > was causing too much of a performance regression? Yeah Peter said that especially reprogramming the clock everytime we call schedule() was killing the performances. Now may be on some workloads, with the tick stopped, we can find some new results. -- 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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