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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

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