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List:       initramfs
Subject:    Re: building initramfs is slow
From:       John Reiser <jreiser () bitwagon ! com>
Date:       2011-08-19 18:27:25
Message-ID: 4E4EAB0D.4000604 () bitwagon ! com
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On 08/18/2011 09:53 PM, WANG Cong wrote:

> Can you add -M to see which modules are loaded?

I'm going to skip this because of other people's responses in the meantime.
About 450 of the 2363 *.ko kernel modules in Fedora 16 were loaded.
See also the histogram below.

> 
> As a kdump developer, I worry more about the size of initramfs generated
> by dracut, because we have very limited memory (usually 128M or 256M)
> in the second kernel. So, the output of `lsinitrd test2.img` would
> be helpful too.

Fedora releases, pre-releases, and Live media are readily available.
You should be able to download, install/boot, and experiment in half a day.
$(lsinitrd test2.img) is too long, so I've made a sorted histogram
of number files by directory, and include the beginning here.
[My quick-and-dirty methodology might have holes.]

    188 lib/kbd/consolefonts/
    120 lib/kbd/keymaps/i386/qwerty/
     88 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/net/
     88 lib64/
     63 lib/kbd/unimaps/
     62 lib/firmware/radeon/
     61 sbin/
     59 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/ata/
     55 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/scsi/
     48 lib/kbd/consoletrans/
     46 lib/modules/3.0.0-1.fc16.x86_64/kernel/crypto/
     44 lib/modules/3.0.0-1.fc16.x86_64/kernel/fs/
     40 usr/share/plymouth/themes/charge/
     39 lib/kbd/consolefonts/partialfonts/
     38 lib/modules/3.0.0-1.fc16.x86_64/kernel/fs/nls/
     29 bin/
     28 lib/firmware/
     25 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/
     24 usr/lib64/
     19 lib/kbd/keymaps/i386/include/
     19 etc/
     18 lib/modules/3.0.0-1.fc16.x86_64/
     18 lib/kbd/keymaps/i386/qwertz/
     18 lib64/multipath/
     17 lib/kbd/keymaps/mac/all/
     17 lib/dracut/hooks/cmdline/
     16 lib/kbd/keymaps/sun/
     15 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/usb/storage/
     15 lib/modules/3.0.0-1.fc16.x86_64/kernel/drivers/md/
     13 lib/udev/rules.d/
     12 lib/dracut/hooks/

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