Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266879AbUIATGN (ORCPT ); Wed, 1 Sep 2004 15:06:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267411AbUIATGM (ORCPT ); Wed, 1 Sep 2004 15:06:12 -0400 Received: from holomorphy.com ([207.189.100.168]:33991 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S266879AbUIATGH (ORCPT ); Wed, 1 Sep 2004 15:06:07 -0400 Date: Wed, 1 Sep 2004 12:06:00 -0700 From: William Lee Irwin III To: Andrew Morton Cc: Matthew Wilcox , linux-kernel@vger.kernel.org Subject: Re: page fault scalability patch final : i386 tested, x86_64 support added Message-ID: <20040901190600.GM5492@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Andrew Morton , Matthew Wilcox , linux-kernel@vger.kernel.org References: <20040827173641.5cfb79f6.akpm@osdl.org> <20040828010253.GA50329@muc.de> <20040827183940.33b38bc2.akpm@osdl.org> <16687.59671.869708.795999@cargo.ozlabs.ibm.com> <20040827204241.25da512b.akpm@osdl.org> <20040827223954.7d021aac.akpm@osdl.org> <20040901180352.GH642@parcelfarce.linux.theplanet.co.uk> <20040901111911.66e89189.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040901111911.66e89189.akpm@osdl.org> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 946 Lines: 22 Matthew Wilcox wrote: >> Sure, but the same kind of app can also do this on 32-bit architectures. >> Assuming there's only 2.5GB of address space available per process, >> you'd need 1638 cooperating processes to do it. OK, that's a lot but >> the lowest limit I can spy on a quick poll of multiuser boxes I have a >> login on is 3064. Most are above 10,000 (poll sample includes Debian, >> RHAS and Fedora). On Wed, Sep 01, 2004 at 11:19:11AM -0700, Andrew Morton wrote: > It requires 32GB's worth of pte's. > So yeah, it might be possible on a 64GB ia32 box. This only requires approximately 10922.666666666666 processes, which has surprisingly been done in practice. -- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/