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From: craig@gnofn.org (Craig Johnston) Newsgroups: alt.comp.periphs.mainboard.abit,comp.sys.ibm.pc.hardware.chips,comp.unix.bsd.freebsd.misc Subject: ABIT IT5H slow mem bandwidth? Date: 6 Jun 1997 19:33:57 -0500 Organization: Greater New Orleans Freenet Lines: 30 Message-ID: <5naa9l$kdr@junkie.gnofn.org> NNTP-Posting-Host: junkie.gnofn.org Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!metro!metro!munnari.OZ.AU!news.Hawaii.Edu!news.lava.net!news.flex.com!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!newsfeed.internetmci.com!uuneo.neosoft.com!junkie.gnofn.org!not-for-mail Xref: euryale.cc.adfa.oz.au comp.sys.ibm.pc.hardware.chips:150634 comp.unix.bsd.freebsd.misc:42551 Running FreeBSD-2.2.2 on an Asus T2P4 (the hx one if I messed that number up) with an AMD K5-PR133 and on an ABIT IT5H with an AMD K5-PR166. Both systems have 60ns FPM dram and 512K cache. Both systems have the kernel configured NOT to use the FPU for memory moves. (this is slower on non-intel chips.. FYI set flags for npx0 in kernel config file to 0x7) The simple memory bandwidth benchmark: dd if=/dev/zero of=/dev/null bs=1m count=100 gives 86 mb/sec for the Asus w/PR133 and 60 mb/sec for the ABIT w/PR166. What gives? The Asus is supposed to be slow, The ABIT fast, and the ABIT has a faster CPU. Possibilities: The ABIT's mem bandwidth sucks, or perhaps a 1.75 multiplier in the PR166 vs a 1.5 mult. for the PR133 makes a difference, or something else entirely. Any clues? Anyone else have figures for K5s on these or other mobos with this bench under FreeBSD? (be sure npx0 flags 0x7 is set in kernel config.) regards, Craig