All of lore.kernel.org
 help / color / mirror / Atom feed
From: Rusty Russell <rusty@rustcorp.com.au>
To: Andreas Robinson <andr345@gmail.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>,
	sam@ravnborg.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel.
Date: Tue, 24 Feb 2009 11:57:10 +1030	[thread overview]
Message-ID: <200902241157.12067.rusty@rustcorp.com.au> (raw)
In-Reply-To: <cc43514a0902191637h5a9680c5id95f7d6c32cca472@mail.gmail.com>

On Friday 20 February 2009 11:07:05 Andreas Robinson wrote:
> 1. Monolithic:  6.27 s, (0.22). bzImg=3419 kB ramfs=515 kB
> 2. Megamodule:  6.80 s, (0.16). bzImg=2297 kB ramfs=1783 kB
> 3. Insmod list: 6.83 s, (0.07). bzImg=2297 kB ramfs=1942 kB
> 
> 10 samples were taken in each case. Standard deviations are in parenthesis.
> The measured times are printk timestamps from a dummy module inserted last.
> 
> Reading these benchmark results I can only conclude that my work is
> useless and life has no meaning.

I know that feeling!  Performance work tends to be like that.  I assume this
is an unpatched kernel, or did you apply some of the stop_machine prevention
/ lock reduction patches?
 
> So, what's missing or been done wrong here? I expected the difference
> between monolithic and modular to be greater to be honest.

modprobe vs insmod?

You could try copying /lib/modules/`uname -r`/modules.* and using modprobe,
see if the slowdown is actually there.

Thanks for chasing this!
Rusty.
Rusty.

  parent reply	other threads:[~2009-02-24  1:27 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-15 18:20 [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 1/6] New option: Static linking of external modules Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 2/6] module: add module ELF section with module_init() pointer Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 3/6] module: always prefix module parameters with the module name Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 4/6] kbuild: allow linking of an external object into vmlinux Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 5/6] scripts: new module preprocessor for static linking Andreas Robinson
2009-02-15 18:20 ` [RFC PATCH 6/6] kbuild: enable relinking of vmlinux without full kernel tree Andreas Robinson
2009-02-16 22:51 ` [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel Rusty Russell
2009-02-17 10:42   ` Andreas Robinson
2009-02-17 11:53     ` Kay Sievers
2009-02-18  4:58       ` Rusty Russell
2009-02-18  9:15         ` Kay Sievers
2009-02-18 10:25           ` Andreas Robinson
2009-02-20  0:37             ` Andreas Robinson
2009-02-20  1:55               ` Kay Sievers
2009-02-21 11:43                 ` Andreas Robinson
2009-03-02 14:32                   ` Andreas Robinson
2009-03-02 15:59                     ` Kay Sievers
2009-03-02 16:20                     ` Arjan van de Ven
2009-03-02 16:29                       ` Kay Sievers
2009-03-02 18:27                         ` Arjan van de Ven
2009-03-02 21:41                           ` Andreas Robinson
2009-03-04 18:47                           ` Andreas Robinson
2009-03-06  0:18                             ` Arjan van de Ven
2009-03-06 15:15                               ` Andreas Robinson
2009-03-06 15:45                                 ` Arjan van de Ven
2009-03-08 10:47                                   ` Andreas Robinson
2009-03-08 16:01                                     ` Arjan van de Ven
2009-03-08 20:13                                       ` [PATCH] sata_nv: add a module parameter to enable async scanning Andreas Robinson
2009-03-09 17:12                                       ` [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel Will Newton
2009-03-06  7:05                       ` fastboot kernel parameter Sitsofe Wheeler
2009-03-06 11:23                         ` Arjan van de Ven
2009-02-24  1:27               ` Rusty Russell [this message]
2009-02-18 11:57           ` [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel Rusty Russell
2009-02-18 13:57             ` Kay Sievers
2009-02-19 11:15               ` Rusty Russell
2009-02-19 11:41                 ` Kay Sievers
2009-02-19 20:48                   ` Kay Sievers
2009-02-19 21:59                     ` Kay Sievers
2009-02-20  0:58                       ` Rusty Russell
2009-02-20  1:33                         ` Kay Sievers
2009-02-24  1:39                           ` Rusty Russell
2009-02-20 11:32                         ` Rusty Russell
2009-02-23 16:42                           ` Kay Sievers
2009-02-25  7:03                             ` Rusty Russell
2009-02-25 18:12                               ` Kay Sievers

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=200902241157.12067.rusty@rustcorp.com.au \
    --to=rusty@rustcorp.com.au \
    --cc=andr345@gmail.com \
    --cc=kay.sievers@vrfy.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sam@ravnborg.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.