[Buildroot] [Bug 6596] New: Slow bootup if mdev is chosen
bugzilla at busybox.net
bugzilla at busybox.net
Thu Oct 24 06:41:24 UTC 2013
https://bugs.busybox.net/show_bug.cgi?id=6596
Summary: Slow bootup if mdev is chosen
Product: buildroot
Version: 2013.08
Platform: Other
OS/Version: Linux
Status: NEW
Severity: minor
Priority: P5
Component: Other
AssignedTo: unassigned at buildroot.uclibc.org
ReportedBy: andreas.koop at zf.com
CC: buildroot at uclibc.org
Estimated Hours: 0.0
Created attachment 5090
--> https://bugs.busybox.net/attachment.cgi?id=5090
disable CONFIG_UEVENT_HELPER_PATH option
When I choose mdev my Nios II based board stalls for about two minutes during
boot up. Then it proceeds again and boots normally. I've tracked the issue
down. It's because buildroot sets CONFIG_UEVENT_HELPER_PATH to "/sbin/mdev"
during kernel configuration. When I set it to an empty string Linux (3.10.0)
boots up as usual again.
If you look at the kernel's own description of CONFIG_UEVENT_HELPER_PATH it
states it shouldn't be used today anymore since it creates a high system load
on bootup.
Mdev still works after it's startup script has been run. It writes "/sbin/mdev"
to /proc/sys/kernel/hotplug which causes the kernel to inform mdev about new
events.
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