From owner-freebsd-hackers Thu Dec 2 7:35: 3 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from acl.lanl.gov (acl.lanl.gov [128.165.147.1]) by hub.freebsd.org (Postfix) with ESMTP id B87E014D06 for ; Thu, 2 Dec 1999 07:35:01 -0800 (PST) (envelope-from rminnich@lanl.gov) Received: from mini.acl.lanl.gov (root@mini.acl.lanl.gov [128.165.147.34]) by acl.lanl.gov (8.8.8/8.8.5) with ESMTP id IAA348128 for ; Thu, 2 Dec 1999 08:33:57 -0700 (MST) Received: from localhost (rminnich@localhost) by mini.acl.lanl.gov (8.9.3/8.8.8) with ESMTP id IAA05514 for ; Thu, 2 Dec 1999 08:33:57 -0700 X-Authentication-Warning: mini.acl.lanl.gov: rminnich owned process doing -bs Date: Thu, 2 Dec 1999 08:33:57 -0700 (MST) From: "Ronald G. Minnich" X-Sender: rminnich@mini.acl.lanl.gov To: freebsd-hackers@FreeBSD.ORG Subject: Re: memory-to-memory copy In-Reply-To: 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, 1 Dec 1999, Zhihui Zhang wrote: > I used to know that memory to memory copy is done by the DMA controller in > the I/O bridge (Actually, this knowledge confues me because DMA controller Now, that brings back memories :-) check out the original dma chip design, ca. infinite years ago. Wow, did freebsd ever use this for bcopy? Hard to see that it would pay ... I know that early 8086 code did use it though. ron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message