From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <397337EF.58667DD@colorfullife.com> Date: Mon, 17 Jul 2000 18:44:31 +0200 From: Manfred Spraul MIME-Version: 1.0 Subject: Re: [PATCH] 2.2.17pre7 VM enhancement Re: I/O performance on References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel , linux-mm@kvack.org List-ID: Rik van Riel wrote: > > > Actually, FreeBSD has a special case in the page fault code > for sequential accesses and I believe we must have that too. > Where is that code? I found a sysctl parameter vm_pageout_algorithm_lru, but nothing else. > Both LRU and LFU break down on linear accesses to an array > that doesn't fit in memory. In that case you really want > MRU replacement, with some simple code that "detects the > window size" you need to keep in memory. This seems to be > the only way to get any speedup on such programs when you > increase memory size to something which is still smaller > than the total program size. > Do you have an idea how to detect that situation? -- Manfred -- 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.eu.org/Linux-MM/