1, some progress
- if gdm is enabled, even '$' over ttyO2 comes very late when login from
serial tty, see detailed analysis
in next part.
- if gdm is disabled, '$' over ttyO2 comes very quickly if login from serial
tty.
- so gdm is involved in the slow boot issue
2, strace log
With help from jk, strace is used to trace getty and find stat64 and read(3)
consumes much time,
stat64: 24.9sec, read(3): 27.12sec, see below in getty.trace:
- stat64
1806 12:35:34.668235 stat64("/usr/bin/awk", <unfinished ...>
......
1806 12:35:59.595877 <... stat64 resumed> {st_mode=S_IFREG|0755,
st_size=73912, ...}) = 0 <24.927520>
- read
1803 12:35:34.663474 read(3, <unfinished ...>
......
1803 12:36:01.792106 <... read resumed> "/dev/mmcblk0p2\n", 128) = 15
<27.128540>
** Attachment added: "gettty.tar.gz"
https://bugs.launchpad.net/ubuntu/+source/linux-ti-omap4/+bug/784421/+attachment/2144441/+files/gettty.tar.gz
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https://bugs.launchpad.net/bugs/784421
Title:
natty slow boot on pandaboard(rev A1)
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