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Received: by minnie.vk1xwt.ampr.org with NNTP id AA150 ; Thu, 28 Jan 93 22:02:24 EST Newsgroups: comp.unix.bsd Path: sserve!manuel.anu.edu.au!munnari.oz.au!spool.mu.edu!uwm.edu!caen!umeecs!quip.eecs.umich.edu!dmuntz From: dmuntz@quip.eecs.umich.edu (Dan Muntz) Subject: [386BSD] processor caching effect on kernel build Message-ID: <1993Jan27.205537.18117@zip.eecs.umich.edu> Sender: news@zip.eecs.umich.edu (Mr. News) Organization: University of Michigan EECS Dept., Ann Arbor, MI Date: Wed, 27 Jan 1993 20:55:37 GMT Lines: 37 People have been wondering about how the internal and external caches affect performance under 386bsd. Here are some numbers I got doing kernel builds. System: 486DX50 (8k internal cache) EISA 16mb 80ns (4 4Mx9 simms) Adaptec 1542B (ISA) scsi Micropolis 1528 scsi disk 256k 20ns external cache 64mb swap (whatever portion of 64mb 386bsd is capable of using) gcc version 1.39 both caches disabled: make depend: 05:38.13 make: 28:51.15 external cache enabled, internal disabled: make depend: 05:37.53 make: 28:49.88 internal cache enabled, external disabled: make depend: 01:35.66 make: 07:49.75 both caches enabled: make depend: 01:25.28 make: 06:10.84 Kernel being built is 0.1 + patchkit0.2 + julian's scsi + pcfs + minor patches Running kernel is the same (and contains NONOP patch recently posted). You've just got to love 7:36 for building a kernel from scratch :) -Dan dmuntz@eecs.umich.edu