于 2011年05月10日 03:51, Koen Kooi 写道: > > Op 9 mei 2011, om 21:43 heeft Lennart Poettering het volgende geschreven: > >> On Mon, 09.05.11 11:53, Scott James Remnant (sc...@netsplit.com) wrote: >> >>> Another question I wasn't able to find an answer to in the documentation >>> I've read so far. >>> >>> The use of device units seems to very much rely on udevd running on the >>> system, and not only that, udev rules having been parsed for the device and >>> a systemd tag "set" in the udevdb. udev obviously starts after systemd, and >>> systemd starts after the kernel. >> >> Correct. >> >>> This means there are a large number of devices already known to the kernel >>> at the point that systemd starts, especially if you build the drivers into >>> the kernel for those devices. It's possible to get going straight away with >>> those devices. But relying on udevd tagging them means you end up waiting >>> around for udevd to start, and worse! since udevd doesn't apply rules to >>> existing devices on startup, you have to wait around for "udevadm trigger" >>> to be run. >> >> That's actually dead fast > > It's still in the 10 second range on a 600MHz cortex-a8 machine booting from > an SD card. I need to dig out my 400MHz arm920t to see how long it takes > there. So having udev-less operation in systemd would be nice, even if it's > only used on 'embedded'
I had an ARM9 with Gentoo + systemd installed. Systemd itself boot system in about 20s. But it tooks 10s+ to mount the yaffs2 root fs. So, 30s+ to boot. Hope this data will be useful to you. > > regards, > > Koen > _______________________________________________ > systemd-devel mailing list > systemd-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/systemd-devel
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