Date: Thu, 1 Jul 1999 18:48:37 -0500 (CDT) From: "M. L. Dodson" <bdodson@beowulf.utmb.edu> To: Arcady Genkin <a.genkin@utoronto.ca> Cc: Guy Helmer <ghelmer@scl.ameslab.gov>, "M. L. Dodson" <bdodson@beowulf.utmb.edu>, freebsd-questions@freebsd.org Subject: Re: FreeBSD is painfully slow on my 486 Message-ID: <199907012348.SAA00362@wotan.611.chedworth.hou.tx.us> In-Reply-To: <879090rlwr.fsf@main.wgaf.net> References: <Pine.SGI.4.10.9907011656050.19092-100000@demios.scl.ameslab.gov> <879090rlwr.fsf@main.wgaf.net>
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Arcady Genkin writes: > Guy Helmer <ghelmer@scl.ameslab.gov> 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
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