Re: [PATCH 04/14] init: deps: order network interfaces by link order
From: Alexander Holler
Date: Sat Oct 17 2015 - 15:59:13 EST
Am 17.10.2015 um 21:36 schrieb Greg Kroah-Hartman:
On Sat, Oct 17, 2015 at 09:14:34PM +0200, Alexander Holler wrote:
Am 17.10.2015 um 21:08 schrieb Linus Torvalds:
On Sat, Oct 17, 2015 at 12:01 PM, Alexander Holler <holler@xxxxxxxxxxxxx> wrote:
That isn't a flag day thing. It's a config option everyone can turn on and
off whenever he wants.
That's a flag-day thing. We've done it (drm comes to mind - several times).
I'm disappointed, because I _know_ I pointed you in the direction of
stable sorting about a month ago. I really had hoped you'd have taken
that into account.
It's impossible to take it into account because I don't want to miss the
parallelize functionality. And without that, all the stuff doesn't offer
enough benefits to be worse the effort but just adds some time necessary to
do the sorting. It might solve the deferred probe problems, but without much
benefit.
Again, parallelizing does not solve anything, and causes more problems
_and_ makes things take longer. Try it, we have done it in the past and
proven this, it's pretty easy to test :)
I've tested it, otherwise I wouldn't have posted the patches.
Unfortunately it's quiet a lot of work to add dependencies for everything.
So maybe I'm able to offer some better numbers in a year or such, when I
was bored often enough to add more dependencies for initcalls.
Not to mention that small changes in the order can have quiet big
differences in the boot time, so it's quiet hard to parallelize stuff
(add dependencies) correctly like e.g. the pci/acpi/processor stuff.
Especially because many reasons for the current order aren't mentioned
in the source and are hard to see without specific knowledge about the HW.
Alexander Holler
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