From owner-freebsd-hackers Mon Aug 26 07:10:02 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id HAA11806 for hackers-outgoing; Mon, 26 Aug 1996 07:10:02 -0700 (PDT) Received: from post.vale.com (post.vale.com [204.117.217.66]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id HAA11770 for ; Mon, 26 Aug 1996 07:09:50 -0700 (PDT) Received: from jaguar.vale.com by post.vale.com id aa28877; 26 Aug 96 9:09 CDT Received: by jaguar with Microsoft Mail id <01BB932F.47934380@jaguar>; Mon, 26 Aug 1996 09:16:35 -0500 Message-ID: <01BB932F.47934380@jaguar> From: Hal Snyder To: "'Michael L. VanLoon'" Cc: "'freebsd-hackers@freebsd.org'" Subject: Multiple swaps slow down system? Date: Mon, 26 Aug 1996 09:15:14 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Michael L. VanLoon wrote: > I don't know why that happens, but I wouldn't expect it to give you > much of a performance boost, since IDE doesn't do asynchronous I/O (at ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > least under *BSD anyway). If you have a very busy system, I would > expect it to give you a performance drop, in fact. I'm not sure what you mean here by "asynchronous". Can you explain? The last time I looked at hd device drivers, SCSI had it all over IDE just because of DMA support - the old ST506 interface still used by IDE forced the CPU to handle all I/O going to/from the hard drive. Has this changed?