From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: Mainline kernel OLTP performance update Date: Fri, 16 Jan 2009 11:20:32 +0100 Message-ID: <87sknjeemn.fsf@basil.nowhere.org> References: <200901161503.13730.nickpiggin@yahoo.com.au> <20090115201210.ca1a9542.akpm@linux-foundation.org> <200901161746.25205.nickpiggin@yahoo.com.au> <20090116065546.GJ31013@parisc-linux.org> <1232092430.11429.52.camel@ymzhang> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from one.firstfloor.org ([213.235.205.2]:54047 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760440AbZAPKVP (ORCPT ); Fri, 16 Jan 2009 05:21:15 -0500 In-Reply-To: <1232092430.11429.52.camel@ymzhang> (Yanmin Zhang's message of "Fri, 16 Jan 2009 15:53:50 +0800") Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Zhang, Yanmin" Cc: Matthew Wilcox , Nick Piggin , Andrew Morton , netdev@vger.kernel.org, sfr@canb.auug.org.au, matthew.r.wilcox@intel.com, chinang.ma@intel.com, linux-kernel@vger.kernel.org, sharad.c.tripathi@intel.com, arjan@linux.intel.com, suresh.b.siddha@intel.com, harita.chilukuri@intel.com, douglas.w.styner@intel.com, peter.xihong.wang@intel.com, hubert.nueckel@intel.com, chris.mason@oracle.com, srostedt@redhat.com, linux-scsi@vger.kernel.org, andrew.vasquez@qlogic.com, anirban.chakraborty@qlogic.com "Zhang, Yanmin" writes: > I think that's because SLQB > doesn't pass through big object allocation to page allocator. > netperf UDP-U-1k has less improvement with SLQB. That sounds like just the page allocator needs to be improved. That would help everyone. We talked a bit about this earlier, some of the heuristics for hot/cold pages are quite outdated and have been tuned for obsolete machines and also its fast path is quite long. Unfortunately no code currently. -Andi -- ak@linux.intel.com -- Speaking for myself only.