Messages in this thread |  | | | From | Rusty Russell <> | | Subject | Re: [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel. | | Date | Tue, 24 Feb 2009 11:57:10 +1030 |
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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.
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