sorry for off-list reply :-( Am 22.04.2012 13:01, schrieb Lennart Poettering: > On Sat, 21.04.12 13:25, Reindl Harald ([email protected]) wrote: > >> can someone please take a look at this F16 report? >> https://bugzilla.redhat.com/show_bug.cgi?id=806548 >> >> * boot sometimes terrible slow >> * randomly boot fails with udev crashing / timeout >> * shutdown terrible slow >> * partly also on physical machines but not sooo slow >> >> since most of the boot time is consumed by udev and >> the terrible slow shutdown of > 30 seconds happens >> while unmounting "old..." i guess this is not only >> the kernel >> >> feels like interaction between kernel/udev/systemd >> >> on shutdown / reboot i can randomly see each single >> unmounting line for 1-2 seconds, this is odd >> >> i have virtual machines which booted in 5-6 seconds >> and are now degraded up to 1 minute > > The bug report suggests this was about a kernel feature > (CONFIG_RCU_FAST_NO_HZ=y) and not related to systemd, no?
my knowledge is not big enough on internals but "CONFIG_RCU_FAST_NO_HZ=y" exlains also the 1-2 seconds of each unmount message at shutdown? on the other hand, even if: this degraded boot/shutdown should not happen, especially not in combination of systemd/udev/kernel as shipped with F16 in a stable release and at least generally not onlöy because a official kernel config param is set if you really say "CONFIG_RCU_FAST_NO_HZ" must be "no" please add a clear statement to the bugreport - before this change all worked fine and now i have to pray on each boot :-( -- Mit besten Grüßen, Reindl Harald the lounge interactive design GmbH A-1060 Vienna, Hofmühlgasse 17 CTO / software-development / cms-solutions p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40 icq: 154546673, http://www.thelounge.net/ http://www.thelounge.net/signature.asc.what.htm
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