From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ferret.lmh.ox.ac.uk (qmailr@ferret.lmh.ox.ac.uk [163.1.138.204]) by kvack.org (8.8.7/8.8.7) with SMTP id OAA13314 for ; Fri, 4 Dec 1998 14:25:49 -0500 Date: Fri, 4 Dec 1998 19:25:31 +0000 (GMT) From: Chris Evans Subject: Re: [PATCH] swapin readahead and fixes In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Rik van Riel Cc: Linux MM , Linux Kernel List-ID: On Thu, 3 Dec 1998, Rik van Riel wrote: > Hi, > > here is a patch (against 2.1.130, but vs. 2.1.131 should > be trivial) that improves the swapping performance both > during swapout and swapin and contains a few minor fixes. Hi Rik, I'm very interested in performance for sequential swapping. This occurs in for example scientific applications which much sweep through vast arrays much larger than physical RAM. Have you benchmarked booting with low physical RAM, lots of swap and writing a simple program that allocates 100's of Mb of memory and then sequentially accesses every page in a big loop? This is one area in which FreeBSD stomps on us. Theoretically it should be possible to get swap with readahead pulling pages into RAM at disk speed. Cheers Chris -- This is a majordomo managed list. To unsubscribe, send a message with the body 'unsubscribe linux-mm me@address' to: majordomo@kvack.org