Hi, I tried some of these changes and they seemed to work reasonably well apart from the grub2 infrastructure is still a bit immature at running without initrd... specifically
* I couldn't find a way to tell the grub2 scripts in /etc/grub.d (10_linux) that I didn't want initrd; I can edit out the initrd line at boot time * new kernels from yum stopped being installed because the grub2-mkconfig script chain relies on /dev/root which is missing in my initrdless boot; if I make ln -s /dev/sda3 /dev/root then the script starts working again * I suspect other stuff in grub2.cfg isn't needed for initrdless (eg. UUID is still mentioned) I'm not sure where to report this? Bugs against grub2 or something else? Is there a specific forum for initrdless working? -Cam On Tue, Oct 4, 2011 at 10:45 PM, Lennart Poettering <mzerq...@0pointer.de> wrote: > On Tue, 04.10.11 21:01, JB (jb.1234a...@gmail.com) wrote: > >> Results interpretation. >> ----------------------- >> Knoppix won by a wide margin, while: >> - Knoppix having microknoppix fast-parallel boot (based on SysV/LSB scripts) >> and DE with low resources usage and tailored for desktops > >> - Fedora having systemd parallel boot and DE tailored for small and simple >> devices > > ^^^^^ huh? Fedora is not tailored for that. Would be great of it it > was, but that's simply not the case. > > We install LVM and iSCSI and all kinds of other enterprisey stuff > on even the smallest netbook. And LVM is a major source of slowness, > since it requires all devices to be synchronously settled, before > "vgscan" can be called. > > Also, we use SELinux and stuff which doesn't speed things up > either. SELinux has become a lot faster at boot in F16, so that's good, > but there's still a price to pay for it, which is more noticable the > weaker your machine is. That said, I do believe that SELinux is a good > thing and should definitely be part of the default install. > > Another bigger source of slowness at boot is currently Plymouth which > also requires synchronous settling of devices (tough it's not as bad as > LVM in that regard though, but costs too since EDID probing is > apparently quite slow, and has every right to, but right now we delay > the boot processes for that but we shoudl really do that in the > background). > > I have been asking for the removal of LVM from the default install since > a long time, and I am still firmly of the opinion that LVM needs to be > something that folks who want it enable but not something that slows > down everybody else's boot. > > If you want a quick boot on a netbook, then remove LVM, iscsi and the > other enterprisey storage stuff. Then run "systemctl mask > fedora-wait-storage.service fedora-storage-init-late.service > fedora-readonly.service fedora-storage-init.service > fedora-loadmodules.service fedora-autoswap.service > fedora-configure.service rc-local.service" to mask a couple of always-on > services, that are needed for enterprisey and legacy stuff. Also > consider disabling stuff like abrtd, or even rsyslog (if you do all log > output goes to kmsg, which reduces disk acesses and is often good > enough), and audit, cpupower, iptables, lldapd, mcelog, multipathd, > lvm2-monitor, mdmonitor, fcoe, dm-event. Check with "systemctl > list-unit-files" what's still left. Then shortcut the initrd by adding > "rootfstype=ext4" to your kernel cmdline amd replacing > "root=UUID=XXXXXXXXX" by "root=/dev/sda6" (or whatever your harddisk is > named in the kernel; what's important here is that the kernel can't look > for harddisks by uuid on its own, that's only done by the > initrd). Bypassing the initrd is well supported on F16 again, with one > exception: plymouth breaks, so disable that: "plymouth.disable=0" on the > kernel cmdline. On my netbook this gives me a bios-to-gdm bootup time of > around 10s, on my laptop of 5s, and Kay's newer laptop of < 3s. And it's > still an awesomely complete system, including SELinux and everything. > > And if you compare that with Knoppix then you will still be comparing > apples and oranges, but we should be much more in the area of what > Knoppix provides as boot times. > > I'd really like to see Fedora default to some more light-weight > choices. Not only for netbooks and suchlike having LVM and all the > enterprise stuff in the default is a bad choice, but for server VMs > which tend to more lightweight that's the case too. The goals of what is > needed to cope with netbooks and what is needed to cope with > lightweighter VMs are actually much closer then people might think, and > I'd love to see Fedora focus more on both. > > Lennart > > -- > Lennart Poettering - Red Hat, Inc. > -- > devel mailing list > devel@lists.fedoraproject.org > https://admin.fedoraproject.org/mailman/listinfo/devel > -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
