Date: Thu, 15 Jan 2015 16:53:42 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Alexey Dokuchaev <danfe@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Warner Losh <imp@FreeBSD.org> Subject: Re: svn commit: r277204 - head/sys/amd64/conf Message-ID: <20150115135342.GD3698@zxy.spb.ru> In-Reply-To: <20150115134446.GA92636@FreeBSD.org> References: <201501150042.t0F0g7Um018059@svn.freebsd.org> <20150115132303.GA245@zxy.spb.ru> <20150115134446.GA92636@FreeBSD.org>
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On Thu, Jan 15, 2015 at 01:44:46PM +0000, Alexey Dokuchaev wrote: > On Thu, Jan 15, 2015 at 04:23:03PM +0300, Slawa Olhovchenkov wrote: > > On Thu, Jan 15, 2015 at 12:42:07AM +0000, Warner Losh wrote: > > > New Revision: 277204 > > > URL: https://svnweb.freebsd.org/changeset/base/277204 > > > > > > Log: > > > New MINIMAL kernel config. The goal with this configuration is to > > > only compile in those options in GENERIC that cannot be loaded as > > > modules. ufs is still included because many of its options aren't > > > present in the kernel module. There's some other exceptions documented > > > > Are you sure? > > I think defining UFS options in kernel connfig affect to module too. > > When I define this options in kernel config (w/o options FFS) I got > > ufs.ko with this SU, quota, acl etc. > > > > [...] > > This is loadable too. > > Right, it does not look like minimal to me either. But I welcome the > intention. AFAIR last time we had a discussion about why our default > kernel is not MINIMAL, it boiled down to two main problems: 1) loader's > caching of disk reads (which makes loading *.ko's from /boot/loader.conf reading large monolitic kernel is slow too. > a PITA, esp. on ZFS), and 2) robust way to figure out which modules to > load on an arbitrary user's system (so they won't have to write their > /boot/loader.conf from scratch themselves). /boot/loader.conf (with all modules currently present in GENERIC) may be instaled by bsdinstall (and may be part of base.txz). > Speaking of (1), I recall there was one or two attempts to address it > (keyword: fast-loader-3.diff). Can someone with more details on their > hands comment a bit what had happened to that work and are there any > ETA for it to get committed? That would be a big leap forward towards > minimal kernel which can be feasible enough to replace (or be a real > alternative to) GENERIC in the future. This is not only space saving. This is allow to kenv hw.cxgbe.nrxq10g=8 ; kldunload if_cxgbe ; kldload if_cxgbe ; /etc/netstart only a few seconds downtime.
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