From owner-freebsd-current Fri Jan 26 14:14:00 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id OAA01451 for current-outgoing; Fri, 26 Jan 1996 14:14:00 -0800 (PST) Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id OAA01199 for ; Fri, 26 Jan 1996 14:11:22 -0800 (PST) Received: from sax.sax.de by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id XAA28440 for ; Fri, 26 Jan 1996 23:10:08 +0100 Received: by sax.sax.de (8.6.11/8.6.12-s1) with UUCP id XAA19634 for current@freefall.freebsd.org; Fri, 26 Jan 1996 23:10:07 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.7.3/8.6.9) id WAA20194 for current@freefall.freebsd.org; Fri, 26 Jan 1996 22:37:05 +0100 (MET) From: J Wunsch Message-Id: <199601262137.WAA20194@uriah.heep.sax.de> Subject: Re: Good news -- pipe stuff To: current@freefall.freebsd.org Date: Fri, 26 Jan 1996 22:37:04 +0100 (MET) Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199601261541.HAA09194@freefall.freebsd.org> from "John Dyson" at Jan 26, 96 07:41:52 am X-Phone: +49-351-2012 669 X-Mailer: ELM [version 2.4 PL23] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-current@FreeBSD.ORG Precedence: bulk As John Dyson wrote: > Pipe latency is about 2x the speed, pipe bandwidth is about 50% faster, > and I am still evaluating the context switch -- but it is faster. Before > I include the changes, I plan to add more intelligent memory management > of pipes (including making them pageable -- instead of tieing up wired > memory), and page-flipping. Page-flipping should add about 50% more onto > the bandwidth. Well, is this still wish-time? Some other systems seem to allow the specification of the pipe buffer size as a resource limit. Would this fit into a re-implementation, too? -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)