From owner-freebsd-hackers Sun May 19 03:47:46 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id DAA15480 for hackers-outgoing; Sun, 19 May 1996 03:47:46 -0700 (PDT) Received: from melbourne.DIALix.oz.au (seeuucp@melbourne.DIALix.oz.au [192.203.228.98]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id DAA15469 for ; Sun, 19 May 1996 03:47:40 -0700 (PDT) Received: (from seeuucp@localhost) by melbourne.DIALix.oz.au (sendmail) with UUCP id UAA08896 for freebsd-hackers@freebsd.org; Sun, 19 May 1996 20:47:29 +1000 (EST) Received: from localhost (localhost [127.0.0.1]) by putte.seeware.DIALix.oz.au (8.7.5/8.7.3) with SMTP id UAA00247 for ; Sun, 19 May 1996 20:19:10 +1000 (EST) Message-Id: <199605191019.UAA00247@putte.seeware.DIALix.oz.au> X-Authentication-Warning: putte.seeware.DIALix.oz.au: Host localhost [127.0.0.1] didn't use HELO protocol X-Mailer: exmh version 1.6.7 5/3/96 To: freebsd-hackers@freebsd.org Subject: How to interpret lmbench? Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 19 May 1996 20:19:08 +1000 From: Mark Hannon Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi, I have just run some lmbench tests on my 2.1.0-STABLE system and am having some trouble understanding the results. Hippo15 motherboard, AMD4-120MHz CPU, running at 40MHz, 24MB RAM, 128K Cache. I have experimented with setting the DRAM WS at both 2 & 1 (read & write) and also 1 & 1. The results for memory latencies are tabulated below. Host OS Mhz L1 $ L2 $ Main mem TLB Guesses putte.see FreeBSD 2.1-S 118 10 480 483 872 No L2 cache? putte.see FreeBSD 2.1-S 118 10 343 345 635 No L2 cache? What do these numbers mean?? Are they telling me the L2 cache doesn't work?? Looking at the graphs I can only see a couple of distinct levels, what sort of L2 & MB times should I be seeing? Regards/mark -- +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ | Mark Hannon,| FreeBSD - Free Unix for your PC| mark@seeware.DIALix.oz.au| | Melbourne, | PGP key available by fingering | epamha@epa.ericsson.se | | Australia | seeware@melbourne.DIALix.oz.au | | +-=-=-=-=-=-=-+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+