From owner-freebsd-arch@FreeBSD.ORG Wed Nov 19 04:10:12 2014 Return-Path: Delivered-To: freebsd-arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 43180779 for ; Wed, 19 Nov 2014 04:10:12 +0000 (UTC) Received: from mail-pa0-f54.google.com (mail-pa0-f54.google.com [209.85.220.54]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 10D9333D for ; Wed, 19 Nov 2014 04:10:11 +0000 (UTC) Received: by mail-pa0-f54.google.com with SMTP id fb1so634993pad.41 for ; Tue, 18 Nov 2014 20:10:11 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:content-type:mime-version:subject:from :in-reply-to:date:cc:message-id:references:to; bh=F/phn/AxAIRGLjG/WwDMzYlxA+NhEUcM9pWk5ofluGg=; b=IsO+oD5RQxVfhGyBVBXaH5a+oknCFnh4Quxb8BRKdpo5ixoPyq6V8I0A8kNDhzXHHw BZ5s7L5Am8Tzz315wEjuMhdxnQWsN5KxvHv2yi7Ia2xrg2++j1VHiNk1LXPecWK2dPQh ZEQlYeu+J0xMy2FWArThqY83auMS+M78TyLI2hamKq6I5C+UctCdfZ4wJJFzIgMxd0L3 DNZXHcX2mbvAcHs6iZ3zKTwtvETbl5t8r4XuYiFAs4O9VZqrzW+Y8Idji+3kVP4bAovO ddJSfa+CsSCyGtffB2jez6S2i7NWI8dQrqNLbTTP2xitZYJktfaHldH2/znUnuY4SWID BIJg== X-Gm-Message-State: ALoCoQkmiscO/WBRaANTwJtn5PnnmDH4LUGRjVOqOAd7/yWkfGAwtZbmeWkdT4uh3bajdsxqhRuS X-Received: by 10.66.240.71 with SMTP id vy7mr42801726pac.89.1416370211136; Tue, 18 Nov 2014 20:10:11 -0800 (PST) Received: from lgmac-zdu.corp.netflix.com ([69.53.236.236]) by mx.google.com with ESMTPSA id dj1sm435192pbb.48.2014.11.18.20.10.09 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 18 Nov 2014 20:10:10 -0800 (PST) Sender: Warner Losh Content-Type: multipart/signed; boundary="Apple-Mail=_BC8DC997-BA9E-4704-8ECE-49E27B8D31E4"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: kernel linker: Overriding a driver shipped with kernel via module? From: Warner Losh In-Reply-To: <546BEB66.6050909@delphij.net> Date: Tue, 18 Nov 2014 21:10:02 -0700 Message-Id: <7F7BC412-A7E3-4848-B284-92C3FB7EC1DE@bsdimp.com> References: <546A8191.3090208@delphij.net> <20141118124544.GA95731@zxy.spb.ru> <20141119001510.GM24601@funkthat.com> <20141119002718.GP9763@zxy.spb.ru> <20141119003632.GN24601@funkthat.com> <546BEB66.6050909@delphij.net> To: d@delphij.net X-Mailer: Apple Mail (2.1878.6) Cc: "freebsd-arch@FreeBSD.org Arch" , Slawa Olhovchenkov X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Nov 2014 04:10:12 -0000 --Apple-Mail=_BC8DC997-BA9E-4704-8ECE-49E27B8D31E4 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Nov 18, 2014, at 5:59 PM, Xin Li wrote: > It would be, however, a win if we could strip down the kernel > significantly and only load the _required_ modules that are sufficient > to support the kernel to start /etc/rc, where we can load additional > modules on demand (via devd for instance) because this would reduce > I/O at loader stage. I think we need to teach loader to determine > which storage drivers and possibly NFS and network devices to load. For years on my laptop, I ran a stripped kernel and only loaded ata.ko and friends from the boot loader (I can=92t recall if I had to compile = in syscons and atakbd or if I loaded them). I dynamically loaded the rest, but the way I did it was extremely hackish and ugly (I used nomatch stuff that I added to whenever I found new hardware to a file I always appended to). You don=92t need to load any network junk for the laptop case in the = boot loader unless you are a weird mutant that networks boots the stuff. Warner --Apple-Mail=_BC8DC997-BA9E-4704-8ECE-49E27B8D31E4 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJUbBgaAAoJEGwc0Sh9sBEANdgP/1w2Uel3V0k9PfFKl/gAXUnU 7OP0o8VoY0PGJvvJI7MbBrKdj9/jffk+pO/xev6p2sSvjTjHp4k/woGcUhaerkpR BGUjGvZfOoYn5eycSkddbZPqiT2BKG8g8bSrSq7dMfDpj97Gn74ZLnvgQzhHTFt/ LoRt7z60L3ITn+4339JymhjLRG+UmMjuDlGzPHUwNE+2EcCpdXj8WSxvACFiEpVv nrBO9RZdBkvJy0f3husxwhMu/aktFILkY/XdtQr5x8xCFoxvqE/eoWJuSXwBhla3 RaZKpPtF/nURFpfwlzExDxZvFipxqbpxuV7pJj0HkSowaQbZhSR9+QtDy58nfBjD OOdMapQ3G88mvLF+rvH3TDIaHFMx9p3rMP1PKPaIddTf2GWG+fxPXE3uiwXcOtCB OvWa7MFksGpm1J1iUWy+VYjXm2Wc0fLqQDrTDwA2giZ/Ha7y6awPrVjdex/03hlH sb2G2VoNjJGjuEhEIRR1TtmJvPdhEFj7tfnG8PmzRqZ89nf0mrVMO1adhNZdDhkk Tjkpwu97S57h2BL/mZJPm9Oq5/9Ol1bhRWC7lq2tBS75nnGhhk6lXURhaWvmSbAT AOqL9U/LzprCAKaaA8fMgPa1sZljgku4KtF7OM3NUGMrD/qhyzxL/13sqVRkub/v NjgHeIcRz3J+ExD2rNer =DRs+ -----END PGP SIGNATURE----- --Apple-Mail=_BC8DC997-BA9E-4704-8ECE-49E27B8D31E4--