From owner-freebsd-questions Thu Jul 1 17:51: 6 1999 Delivered-To: freebsd-questions@freebsd.org Received: from nagling.611.chedworth.hou.tx.us (251.245.nas1.ippool.hypercon.com [198.64.245.251]) by hub.freebsd.org (Postfix) with ESMTP id 52AEE157CC for ; Thu, 1 Jul 1999 17:50:56 -0700 (PDT) (envelope-from bdodson@beowulf.utmb.edu) Received: from wotan.611.chedworth.hou.tx.us (wotan.611.chedworth.hou.tx.us [10.1.1.49]) by nagling.611.chedworth.hou.tx.us (8.8.8/8.8.8) with ESMTP id TAA13170; Thu, 1 Jul 1999 19:08:17 -0500 (CDT) (envelope-from bdodson@beowulf.utmb.edu) Received: (from bdodson@localhost) by wotan.611.chedworth.hou.tx.us (8.8.8/8.8.8) id SAA00362; Thu, 1 Jul 1999 18:48:37 -0500 (CDT) (envelope-from bdodson) Date: Thu, 1 Jul 1999 18:48:37 -0500 (CDT) Message-Id: <199907012348.SAA00362@wotan.611.chedworth.hou.tx.us> From: "M. L. Dodson" MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: Arcady Genkin Cc: Guy Helmer , "M. L. Dodson" , freebsd-questions@freebsd.org Subject: Re: FreeBSD is painfully slow on my 486 In-Reply-To: <879090rlwr.fsf@main.wgaf.net> References: <879090rlwr.fsf@main.wgaf.net> X-Mailer: VM 6.34 under 19.16 "Lille" XEmacs Lucid Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Arcady Genkin writes: > Guy Helmer writes: > > > I noticed a severe slowdown on some 486's after adding more memory. In > > particular, one 486 with 16MB RAM running FreeBSD 2.x slowed to crawl when > > I added 4MB of RAM. I seem to remember a similar slowdown when going from > > 16MB to 32MB of RAM on a similar 486 running Netware 3.11. In both cases, > > I suspect that the level two cache implemented on the motherboard was only > > able to cache the lower 16MB of RAM. So, I tend to suspect the cache in > > your case. > > But the 386SX had no cache, and, I'm not misrepresenting things, it was faster than the 486 on bonnie, and with IDE vs busmastering SCSI (VLB BusLogic) on the 486. > > Is the 486 an Intel, or another brand? There are a couple of Cyrix kernel > > config options that have to do with cache (see the LINT config file). > Mine was a very early genuine Intel DX-25. > It's an Intel DX4. But the way you explain it should make no > difference what OS runs the computer -- it should be just as slow > under Linux as it is under FBSD, right? But this isn't the case here. :^| > Yes, the slowdown was also obvious (even more so) under Windows (3.1, I think). If you have no hardware changes to accompany the change to FBSD, then obviously this is not applicable. Not that it affects the point I was trying to make, but the memory upgrade I talked about was 16MB -> 32MB, not 8->16 (just so people did not think I was putting in 16 1MB 30pin SIMMS). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message