From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3D4DAE2C.F45BC9D4@zip.com.au> Date: Sun, 04 Aug 2002 15:43:56 -0700 From: Andrew Morton MIME-Version: 1.0 Subject: Re: how not to write a search algorithm References: <3D4CE74A.A827C9BC@zip.com.au> <3D4D87CE.25198C28@zip.com.au> <20020804203804.GD4010@holomorphy.com> <3D4D9802.D1F208F0@zip.com.au> <20020804220218.GF4010@holomorphy.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: Rik van Riel , "linux-mm@kvack.org" List-ID: William Lee Irwin III wrote: > > ... > I had fixing "this box should be able to run a lot of tasks but drops > dead instead" in mind. What subset of this were you looking for? Getting the kernel back to the level of performance and stability which it had before the rmap patch has to be the first step. 1) 50% increase in system load on fork/exec/exit workloads 2) Will oops on pte_chain oom 3) pte_highmem is bust 4) tripled ZONE_NORMAL consumption 5) pte chains go wrong with ntpd 6) Poor swapout bandwidth The first three or four here are fatal to the retention of the reverse map, IMO. Futzing around fixing them is taking time and is holding up other work. I may have a handle on 1). Still working it. -- 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/