From: Valdis.Kletnieks@vt.edu
To: Jesper Juhl <juhl-lkml@dif.dk>
Cc: Borislav Petkov <petkov@uni-muenster.de>,
Edgar Toernig <froese@gmx.de>, jmerkey <jmerkey@utah-nac.org>,
Scott Robert Ladd <lkml@coyotegulch.com>,
linux-kernel@vger.kernel.org
Subject: Re: Automatic .config generation
Date: Sun, 15 May 2005 07:13:41 -0400 [thread overview]
Message-ID: <200505151113.j4FBDf2a011875@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Sun, 15 May 2005 11:52:51 +0200." <Pine.LNX.4.62.0505151148220.2387@dragon.hyggekrogen.localhost>
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On Sun, 15 May 2005 11:52:51 +0200, Jesper Juhl said:
> What's the big gain? Where's the harm in just building all the sound
> modules - you only load one in the end anyway, and the space taken by the
> other modules is negligible with the disk sizes of today I'd say (ok,
> there's some extra build time involved, but that shouldn't be a big deal
If you're doing building and testing on an older/slower box, the build
time and disk size matters - there's 481 'y' or 'm' in my current .config, versus
1701 in the Fedora -1287 kernel. Being able to do 3 build/reboot loops in
an hour versus one every 90 mins makes a big difference. Being able to do a
build in 400M instead of 2G means that a 7G /usr/src/ partition can hold 8 or 9
trees, rather than 3 (useful for those "when did this start" regressions, especially
in combo with that 20 min versus 90 build time. ;)
> you want. Besides, it's not as if you have to redo your kernel config from
> scratch every time you want a new kernel. Make your favorite config once,
> build and install that kernel and then when you want a newer kernel simply
> either cd linux-<version>; zcat /proc/config.gz > .config ; make oldconfig
> and then build the new kernel using your previous config.
Yes, that's easy if you're working on *the same hardware*, so new device drivers
aren't of interest, and the only thing 'make oldconfig' will prompt you for is
new non-driver functionality. However, that's not everybody...
The function is for building streamlined configs for new systems - you get
in a Frobozz2005 laptop, and although you probably have your own favorite set
of values for things like which netfilter modules to build, you probably have
*no* idea right off what device drivers you need. So you end up either going
the RedHat route and building it *all* anyhow, or spending a lot of time
figuring out which drivers you need for *this* box. And you can't even trust
the vendor sometimes - the Dell laptop I'm typing on was part of a larger order.
A co-worker got another C840, and we had both ordered the same CD/RW-DVD drive.
Machines had consecutive Dell service/serial numbers - and different vendor
drives (mine had a Toshiba, his had something else).
I won't even *start* on the number of subtly different AC'97-ish sound chips
Dell has gone through.. ;)
If you have a better solution to the "minimize *total* time to build optimized
kernels for 12 different machines that just got dropped on your workbench
this morning" feel free to share.. ;)
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next prev parent reply other threads:[~2005-05-15 11:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-12 18:05 Automatic .config generation Scott Robert Ladd
2005-05-12 17:07 ` jmerkey
2005-05-12 18:21 ` Matthias-Christian Ott
2005-05-12 18:49 ` Steven Rostedt
2005-05-12 18:33 ` Lennart Sorensen
2005-05-12 21:17 ` Edgar Toernig
2005-05-15 7:03 ` Borislav Petkov
2005-05-15 7:42 ` Valdis.Kletnieks
2005-05-15 9:52 ` Jesper Juhl
2005-05-15 11:13 ` Valdis.Kletnieks [this message]
2005-05-16 12:50 ` Steven Rostedt
2005-05-15 14:08 ` Scott Robert Ladd
2005-05-15 13:52 ` aq
2005-09-06 9:02 Ahmad Reza Cheraghi
2005-09-06 9:12 Ahmad Reza Cheraghi
2005-09-08 20:39 Ahmad Reza Cheraghi
2005-09-08 21:13 ` Alex Riesen
2005-09-09 7:48 ` Ahmad Reza Cheraghi
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