On Wed, Apr 20, 2011 at 02:43:36AM +0200, Lennart Poettering wrote: > On Fri, 18.03.11 13:40, Gustavo Sverzut Barbieri (barbi...@profusion.mobi) > wrote: > > > > > On Fri, Mar 18, 2011 at 10:52 AM, Andrey Borzenkov <arvidj...@mail.ru> > > wrote: > > > On Fri, Mar 18, 2011 at 12:35 PM, fykc...@gmail.com <fykc...@gmail.com> > > > wrote: > > >> Hi all, > > >> > > >> We did a series boot-time tests of systemd, and found some interesting > > >> things: > > >> (Note the tests were performed on a laptop with a 4-core mips cpu, AMD > > >> RS780 chipset, 2GB Memory, rotate harddisk with ext4 filesystem, > > >> debian squeeze, Linux 2.6.36 with fanotify enabled, systemd-v20, only > > >> boot to console.) > > >> > > >> 1. What can readahead affect boot-time? > > >> Sadly observed negative affect -- boot-time increases at least 1s. > > > > > > From subjective feelings (no real measurements) I confirm it. > > > > I noticed it as well, even with my Macbook Pro i7 with 8Gb RAM and > > 128SSD using btrfs. > > Note that btrfs is actually not particularly fast when mounting.
> We do serialization of fsck on rotating media already. This might be > something that fixes itself as soon as the btrfs mounting isn't as slow > anymore as it currently is. You can speed up btrfs mounting with free space caching. Right now it is enable with -o space_cache mount option. But beware: there was some problem identified when free space reporting. I am not sure if fix went to .38 and .39-rc already. -- Tomasz Torcz "God, root, what's the difference?" xmpp: zdzich...@chrome.pl "God is more forgiving." _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel