From owner-freebsd-hackers Wed Mar 21 9:51: 5 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from postfix.conectiva.com.br (perninha.conectiva.com.br [200.250.58.156]) by hub.freebsd.org (Postfix) with ESMTP id 342B337B742 for ; Wed, 21 Mar 2001 09:50:57 -0800 (PST) (envelope-from riel@conectiva.com.br) Received: from burns.conectiva (burns.conectiva [10.0.0.4]) by postfix.conectiva.com.br (Postfix) with SMTP id C1E9A16DFD for ; Wed, 21 Mar 2001 14:50:51 -0300 (EST) Received: (qmail 30402 invoked by uid 0); 21 Mar 2001 17:50:13 -0000 Received: from dial10.ras.conectiva (HELO imladris.rielhome.conectiva) (root@10.0.8.10) by burns.conectiva with SMTP; 21 Mar 2001 17:50:13 -0000 Received: from localhost (IDENT:riel@localhost [127.0.0.1]) by imladris.rielhome.conectiva (8.11.2/8.11.2) with ESMTP id f2LGVjh10858; Wed, 21 Mar 2001 13:31:45 -0300 Date: Wed, 21 Mar 2001 13:31:45 -0300 (BRST) From: Rik van Riel X-Sender: riel@imladris.rielhome.conectiva To: Peter Wemm Cc: Matt Dillon , Alfred Perlstein , "Michael C . Wu" , "Michael C . Wu" , izero@ms26.hinet.net, cross@math.psu.edu, grog@FreeBSD.ORG, fs@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: tuning a VERY heavily (30.0) loaded s cerver In-Reply-To: <200103211114.f2LBE0h57371@mobile.wemm.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wed, 21 Mar 2001, Peter Wemm wrote: > Also, 4MB = 1024 pages, at 28 bytes per mapping == 28k per process. 28 bytes/mapping is a LOT. I've implemented an (admittedly not completely architecture-independent) reverse mapping patch for Linux with an overhead of 8 bytes/pte... I wonder how hard/easy would it be to reduce the memory overhead of some of these old Mach data structures in FreeBSD... regards, Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose... http://www.surriel.com/ http://www.conectiva.com/ http://distro.conectiva.com.br/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message