From: Linus Torvalds Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache Date: Fri, 13 Apr 2012 10:42:10 -0700 Message-ID: References: <20120323221715.GA6712@tassilo.jf.intel.com> <20120324031357.GA5690@tassilo.jf.intel.com> <4F70F51F.8030405@linux.intel.com> <20120326235707.GC19489@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: "Ted Ts'o" , Vivek Haldar , Andreas Dilger , linux-ext4@vger.kernel.org, tim.c.chen@linux.intel.com To: Andi Kleen Return-path: Received: from mail-wg0-f44.google.com ([74.125.82.44]:61168 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752926Ab2DMRmc (ORCPT ); Fri, 13 Apr 2012 13:42:32 -0400 Received: by wgbdr13 with SMTP id dr13so3270265wgb.1 for ; Fri, 13 Apr 2012 10:42:31 -0700 (PDT) In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On Wed, Apr 11, 2012 at 9:59 AM, Andi Kleen wrote: > > Ping. This scalability problem is still in 3.4-rc* and causes > major slowdowns. Do you have numbers? > Can we please revert fix it or revert > 556b27abf73833923d5cd4be80006292e1b31662 before release. That commit ID doesn't make any sense, and doesn't seem to have anything to do with any statistics counters that your email talks about. So regardless, you'd need to explain why that commit causes the problems you talk about, I'm not going to revert a random commit that doesn't even look what you describe. Ted? Linus