On Tue, 04.10.11 21:01, JB (jb.1234abcd@xxxxxxxxx) 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@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
