svn commit: r222980 - in head/sys: amd64/conf i386/conf
dougb at FreeBSD.org
Sat Jun 11 20:55:17 UTC 2011
On 6/11/2011 1:02 PM, Warner Losh wrote:
> On Jun 11, 2011, at 12:17 PM, Doug Barton wrote:
>> On 6/11/2011 6:07 AM, Robert Watson wrote:
>>> To me, this seems like the wrong direction. Over the last decade, we've
>>> been trying to move away from conditional compilation of features to
>>> having them be loadable as modules.
>> FWIW, I agree. I'm wondering though, is there still a performance penalty for modules? My understanding in the past was that there is, although for most use cases it's in the statistical noise. Is that still true?
> At run time, I believe that's true. At load time, lots of modules can take a few seconds longer.
I have 3 or 4 modules loaded via loader.conf at boot time. They take at
least 2 seconds each. IMO loading everything via loader.conf would slow
the boot so much as to be a non-starter.
OTOH, I could imagine an rc.d script that depends on mountcritlocal that
could load a list of modules. Unless I'm missing something that would be
several times faster.
Nothin' ever doesn't change, but nothin' changes much.
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