Messages in this thread | | | Date | Mon, 2 Mar 2009 17:29:57 +0100 | Subject | Re: [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel. | From | Kay Sievers <> |
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On Mon, Mar 2, 2009 at 17:20, Arjan van de Ven <arjan@infradead.org> wrote: >> A monolithic kernel with parallelized initcalls is better - about 200 >> ms faster than parallel insmods on my test system. However, it comes >> with a fairly large set of changes: >> >> * First, you need a 200-line patch in init/main.c (do_initcalls() and >> friends) > > why? > We already have async function calls; and those speed up my boot (when > enabled) significantly, by doing much of the kernel/driver init in > parallel. > > My server box boots the whole kernel (including all drivers; I build > verything in) in 0.56 seconds, and my net books do it in around 1.0 > seconds. > >> >> * Then the built-in module dependencies must be calculated properly, >> eg with a modified depmod, and added to the build process. > > nope not if done right > >> So, what do you think, should I keep going? IMHO, the slower userspace >> implementation is acceptable since it's so much simpler. > > I would strongly suggest that you turn on the async function calls and > look at the boot graph of the resulting kernel boot... if you send > that to me I can also take a look and make suggestions....
The "fastboot" kernel commandline option was used, as mentioned in the mail. Is there anything else?
Thanks, Kay
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