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Created attachment 1012781[details]
weak-modules dd ibs/skip modification
Description of problem:
The /sbin/weak-modules script invokes dd to work on the initramfs image as follows:
dd if="$input" of="${tmpdir}/post_early_cpio.img" ibs=1 skip="$(cpio_len "$input")" 2>/dev/null
This is extremely inefficient because it iterates byte by byte through the whole initramfs image to skip the first $(cpio_len $input) bytes. This takes minutes even on a high end x86-64 machine.
What would be far more sensible is to do the following:
dd if="$input" of="${tmpdir}/post_early_cpio.img" skip=1 ibs="$(cpio_len "$input")" 2>/dev/null
which works in blocks of size $(cpio_len $input) and skips the first one. Working on blocks 10s of 1000s of times bigger, this takes a fraction of a second.
Version-Release number of selected component (if applicable):
kmod-14-10.el7.x86_64
Attached is a patch to fix this.
Created attachment 1025465[details]
use skipcpio to strip early_cpio
Thanks for the patch. Actually, what I could do instead is use dracut's skipcpio (in /usr/lib/dracut) to strip off the early cpio image and then just remove that implementation of cpio in shell entirely. That should speed things up a good bit. Patch attached.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2119.html
Created attachment 1012781 [details] weak-modules dd ibs/skip modification Description of problem: The /sbin/weak-modules script invokes dd to work on the initramfs image as follows: dd if="$input" of="${tmpdir}/post_early_cpio.img" ibs=1 skip="$(cpio_len "$input")" 2>/dev/null This is extremely inefficient because it iterates byte by byte through the whole initramfs image to skip the first $(cpio_len $input) bytes. This takes minutes even on a high end x86-64 machine. What would be far more sensible is to do the following: dd if="$input" of="${tmpdir}/post_early_cpio.img" skip=1 ibs="$(cpio_len "$input")" 2>/dev/null which works in blocks of size $(cpio_len $input) and skips the first one. Working on blocks 10s of 1000s of times bigger, this takes a fraction of a second. Version-Release number of selected component (if applicable): kmod-14-10.el7.x86_64 Attached is a patch to fix this.