From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by kanga.kvack.org (Postfix) with ESMTP id C18576B0035 for ; Tue, 17 Dec 2013 06:59:12 -0500 (EST) Received: by mail-pa0-f44.google.com with SMTP id fa1so4349574pad.17 for ; Tue, 17 Dec 2013 03:59:12 -0800 (PST) Received: from mail-pb0-f50.google.com (mail-pb0-f50.google.com [209.85.160.50]) by mx.google.com with ESMTPS id sj5si11608023pab.81.2013.12.17.03.59.10 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 17 Dec 2013 03:59:11 -0800 (PST) Received: by mail-pb0-f50.google.com with SMTP id rr13so6857810pbb.23 for ; Tue, 17 Dec 2013 03:59:10 -0800 (PST) Message-ID: <52B03C84.1000600@linaro.org> Date: Tue, 17 Dec 2013 19:59:00 +0800 From: Alex Shi MIME-Version: 1.0 Subject: Re: [PATCH 2/3] x86: mm: Change tlb_flushall_shift for IvyBridge References: <1386849309-22584-1-git-send-email-mgorman@suse.de> <1386849309-22584-3-git-send-email-mgorman@suse.de> <20131212131309.GD5806@gmail.com> <52A9BC3A.7010602@linaro.org> <20131212141147.GB17059@gmail.com> <52AA5C92.7030207@linaro.org> <52AA6CB9.60302@linaro.org> <20131214141902.GA16438@laptop.programming.kicks-ass.net> <20131214142741.GB16438@laptop.programming.kicks-ass.net> <20131216135901.GA6171@gmail.com> In-Reply-To: <20131216135901.GA6171@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar , Peter Zijlstra Cc: Mel Gorman , H Peter Anvin , Linux-X86 , Linux-MM , LKML , Linus Torvalds , Andrew Morton , Thomas Gleixner , Fengguang Wu On 12/16/2013 09:59 PM, Ingo Molnar wrote: > So if the kbuild speedup of 1-2% is true and reproducable then that > might be worth doing. I have a Intel desktop and need it for daily works. Wonder if Intel guys like to have a try? I assume the patch is already in Fengguang's testing system. > > Building the kernel is obviously a prime workload - and given that the > kernel is active only about 10% of the time for a typical kernel > build, a 1-2% speedup means a 10-20% speedup in kernel performance > (which sounds a bit too good at first glance). Maybe a extra time tlb flush causes more tlb refill that cost much user space time. -- Thanks Alex -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org