*BSD News Article 43308


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From: bmk@dtr.com (Brant Katkansky)
Newsgroups: comp.os.386bsd.questions
Subject: Re: Suggestion on recompiling kernel
Date: 9 Mar 1995 18:14:39 -0800
Organization: DTR/net - Portland OR (info@dtr.com)
Lines: 34
Message-ID: <3jocmf$fja@everest.dtr.com>
References: <3jm3eb$dkl@news.bu.edu> <MICHAELV.95Mar8223323@MindBender.HeadCandy.com>
NNTP-Posting-Host: dtr.rain.com

>In article <MICHAELV.95Mar8223323@MindBender.HeadCandy.com>,
>Michael L. VanLoon <michaelv@MindBender.HeadCandy.com> wrote:
>>In article <3jm3eb$dkl@news.bu.edu> mi@cs.bu.edu (Mikhail Teterin) writes:
>>
>>   Suggestion that can save hours of rebuilding. After changing your 
>>   config
>
>*HOURS*???
>
>It only takes me 23 minutes to do a *complete* clean build of a kernel
>on my NetBSD-1.0 machine: 486DX2/80, 20MB RAM, EISA bus SCSI, etc.  I
>can't imagine that FreeBSD is THAT much different.

A useless data point:

The kernel on my gateway takes ~41 minutes to compile after the 
"config KERNEL".  This was done when the system was (reasonably) 
lightly loaded.  This is FreeBSD 2.0-950210-SNAP.  The GENERIC kernel
compiles only a few minutes faster.

# /usr/bin/time sh -c 'make depend; make'
[snip]
     2449.60 real      1903.47 user      339.71 sys

This is on a i486DX2-66, 32MB, Buslogic 445 VLB.  The source resides on
a fairly slow SCSI disk, but that's probably not a factor.   Of
course, your machine with it's 80Mhz processor and EISA SCSI is probably
a tad faster than mine.  I'd say they're not that much different
considering the disparity in our hardware.  I'd hate to get involved
with, much less start, a "my-OS-is-faster-than-your-OS" flamefest. :)
-- 
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