Will booting faster if all modules built in kernel?

cuihao · 2011-06-06 07:59:15

I think booting should be faster if compiling all needed modules built-in (not in initrd file but kernel binary) , for there is no need to modprobe when booting (then I can remove udev hook and modprobe from initrd).

Is it really effective?

litemotiv · 2011-06-06 08:02:36

Yes it will be faster, but how much really depends on the circumstances. For comparison, i use the regular initramfs in combination with systemd on an ssd, and my system boots from grub to X in less than 5 seconds. So it really depends on what your goals are, which soft- and hardware you use, and how much time you are willing to invest.

cuihao · 2011-06-06 08:10:56

Using systemd and e4rat, my system boots from grub to X in about 13 secs now (normal HDD).
I am looking for ways to make it faster.

ChoK · 2011-06-06 11:33:40

You won't gain more than ~3 seconds without an hardware change or bypassing the fsck check. I hope to be proved wrong though.

cuihao · 2011-06-06 13:03:38

It seems ChoK is right.
I have trid for an afternoon, but boot time was never less.
Without disabling fsck and other services, 12 secs should be my mechine's best.

Viper_Scull · 2011-06-06 16:11:55

litemotiv wrote:

Yes it will be faster, but how much really depends on the circumstances. For comparison, i use the regular initramfs in combination with systemd on an ssd, and my system boots from grub to X in less than 5 seconds. So it really depends on what your goals are, which soft- and hardware you use, and how much time you are willing to invest.

When you folks say to X, do you mean to the Display Manager?

My conf is SSD + systemd + slim + xfce 4.8 + everything built into the kernel. auto-login.

from grub to the desktop in about 9 seconds.

Last edited by Viper_Scull (2011-06-06 16:16:05)

cuihao · 2011-06-07 03:52:34

My bootchartd:
http://photos5.media.pix.ie/54/E1/54E1E … 5D3329.png

HDD, without disabling fsck
using e4rat, systemd
modified init script and base hook, re-compiled minimal busybox
all needed modules built-in (except nvidia driver)

Last edited by cuihao (2011-06-07 04:48:05)

ChoK · 2011-06-08 12:53:48

By the way fastboot was a 2.6.29 only kernel parameter because it was unstable, see here http://lkml.indiana.edu/hypermail/linux … 02402.html . Everything has been merged by default in 2.6.30, more relevant stuff here http://www.h-online.com/open/news/item/ … 41921.html .

Arch Linux

#1 2011-06-06 07:59:15

Will booting faster if all modules built in kernel?

#2 2011-06-06 08:02:36

Re: Will booting faster if all modules built in kernel?

#3 2011-06-06 08:10:56

Re: Will booting faster if all modules built in kernel?

#4 2011-06-06 11:33:40

Re: Will booting faster if all modules built in kernel?

#5 2011-06-06 13:03:38

Re: Will booting faster if all modules built in kernel?

#6 2011-06-06 16:11:55

Re: Will booting faster if all modules built in kernel?

#7 2011-06-07 03:52:34

Re: Will booting faster if all modules built in kernel?

#8 2011-06-08 12:53:48

Re: Will booting faster if all modules built in kernel?

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