svn commit: r277204 - head/sys/amd64/conf
Slawa Olhovchenkov
slw at zxy.spb.ru
Thu Jan 15 13:53:45 UTC 2015
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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