Le samedi 26 novembre 2011 à 22:52 +0100, Stefan Majewsky a écrit : > Hi, > > my openSUSE 12.1 system boots in about 30 seconds, and I wanted to cut > that time down a bit, so I took a look at systemd-analyze's blame and > plot output. > > But I do not really know how to interpret the results which I see in > the plot [1]. The startup sequence takes 20.5 seconds in userspace, of > which only the last 3 seconds seem to be spent on what I consider "the > interesting stuff": starting all sorts of services and finally > bringing up KDM. > > The rest of the time seems to be spent activating the hardware, > various mounts and udev. (According to the LED on my notebook's case, > the disk is busy all the time.) To put my confusion into questions: > > 1. Why does the system need 6 seconds (from t=6.3s to t=12.3s on the > plot) to activate some tmpfs mounts? > > 2. Why is localnet.service activating for a whole 7 seconds? I looked > into it, it's only a SysV init script that sets hostname and > domainname from the config in /etc, yet it's number 1 in > systemd-analyze blame. > > 3. Why does it look like about nothing happens between t=13s and t=22s? > > It might be that openSUSE's unit files (or SysV leftovers) are not yet > optimized for the early boot: For example, I seem to have saved some > seconds by masking lvm.service (I don't use LVM at all). But that > won't explain why systemd is actually slower on this stage of boot vs. > the old SysV init some distro versions ago. > > Can someone enlighten me?
Some comments regarding your numbers, since they might be caused by tradeoffs I had to put in openSUSE systemd package : - if you don't use cryptsetup (encrypted partition), you should run "systemctl mask storage-after-cryptsetup.service", it should remove the lvm.service reload after cryptsetup.target is reached - if you don't use lvm, systemctl mask lvm.service might help too - localnet.service is still doing too much work, because part of its work is already done by systemd but I didn't had time to move the nisdomain part out of /etc/init.d/boot.localnet to a separate script (or .service). -- Frederic Crozat <[email protected]> SUSE _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
