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From: Harald Hoyer <harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: John Reiser <jreiser-Po6cBsTGB2ZWk0Htik3J/w@public.gmane.org>
Cc: initramfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: building initramfs is slow
Date: Fri, 19 Aug 2011 09:03:32 +0200	[thread overview]
Message-ID: <4E4E0AC4.1020709@redhat.com> (raw)
In-Reply-To: <4E4D5779.6090209-Po6cBsTGB2ZWk0Htik3J/w@public.gmane.org>

On 18.08.2011 20:18, John Reiser wrote:
> Building an initramfs is unreasonably slow.  On Fedora 16
> dracut-011 takes almost a minute when installing a new kernel:
>    real   56s
>    user   20s   \__   dracut is CPU bound, not I/O bound.
>    sys    31s   /
> The final "gzip -9" takes 12 seconds, and the cpio 1 second,
> which leaves 43 seconds for the rest of dracut.  That's a
> factor of 3 or 4 too long.  The output initramfs is 14.9MB
> (41MB unzipped) and contains 1619 files, including 367 .ko
> kernel modules.

Some general thoughts.

1. speed at initramfs creation time is not sooo important. Normally this is only
done once in a while and not every day. Boot speed is more important.

2. if you care about speed of creation and size of the initramfs, turn on
"hostonly" in /etc/dracut.conf


> Yes, I'm going to work on it.
> 

That's cool! I accept patches :-)

  parent reply	other threads:[~2011-08-19  7:03 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-18 18:18 building initramfs is slow John Reiser
     [not found] ` <CALAkbJOkMTQdkmhBBvqHk3oKRzMHvXcp1MxasMrMpCbTP3+0eg@mail.gmail.com>
     [not found]   ` <CALAkbJOkMTQdkmhBBvqHk3oKRzMHvXcp1MxasMrMpCbTP3+0eg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-08-18 23:09     ` John Reiser
2011-08-19  4:53       ` WANG Cong
2011-08-19  6:47         ` Harald Hoyer
     [not found]           ` <4E4E0707.4060504-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-08-19  7:04             ` Américo Wang
     [not found]               ` <CAM_iQpUr2mVRM+PFeYkefzx9xEAOJKhZh+wpaXgKg6bj+1dozQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-08-19  7:07                 ` Harald Hoyer
     [not found]                   ` <4E4E0B95.6040909-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-08-19  7:32                     ` Dan Horák
2011-08-19 18:27         ` John Reiser
     [not found] ` <4E4D5779.6090209-Po6cBsTGB2ZWk0Htik3J/w@public.gmane.org>
2011-08-19  7:03   ` Harald Hoyer [this message]
2011-08-19  8:24   ` Harald Hoyer

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