From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <45E8B32B.4050903@mbligh.org> Date: Fri, 02 Mar 2007 15:28:43 -0800 From: "Martin J. Bligh" MIME-Version: 1.0 Subject: Re: The performance and behaviour of the anti-fragmentation related patches References: <20070301101249.GA29351@skynet.ie> <20070301160915.6da876c5.akpm@linux-foundation.org> <45E842F6.5010105@redhat.com> <20070302085838.bcf9099e.akpm@linux-foundation.org> <20070302093501.34c6ef2a.akpm@linux-foundation.org> <45E8624E.2080001@redhat.com> <20070302100619.cec06d6a.akpm@linux-foundation.org> <45E86BA0.50508@redhat.com> <20070302211207.GJ10643@holomorphy.com> <45E894D7.2040309@redhat.com> <20070302135243.ada51084.akpm@linux-foundation.org> <45E89F1E.8020803@redhat.com> <20070302142256.0127f5ac.akpm@linux-foundation.org> <45E8A677.7000205@redhat.com> <45E8AA64.3050506@mbligh.org> <45E8AB36.3030104@redhat.com> In-Reply-To: <45E8AB36.3030104@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: Andrew Morton , Bill Irwin , Christoph Lameter , Mel Gorman , npiggin@suse.de, mingo@elte.hu, jschopp@austin.ibm.com, arjan@infradead.org, torvalds@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: >>> 32GB is pretty much the minimum size to reproduce some of these >>> problems. Some workloads may need larger systems to easily trigger >>> them. >> >> We can find a 32GB system here pretty easily to test things on if >> need be. Setting up large commercial databases is much harder. > > That's my problem, too. > > There does not seem to exist any single set of test cases that > accurately predicts how the VM will behave with customer > workloads. Tracing might help? Showing Andrew traces of what happened in production for the prev_priority change made it much easier to demonstrate and explain the real problem ... M. -- 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