Date: Wed, 26 Feb 2014 14:05:04 -0800 From: Luigi Rizzo <rizzo@iet.unipi.it> To: "arch@freebsd.org" <arch@freebsd.org> Subject: Re: small kernel kernel option... Message-ID: <CA%2BhQ2%2BiEmvTfRd%2B7k3mZjWdDBgFqxBHnq4fj5M6=BwhaoP08Qg@mail.gmail.com> In-Reply-To: <20140226214816.GB92037@funkthat.com> References: <20140226214816.GB92037@funkthat.com>
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On Wednesday, February 26, 2014, John-Mark Gurney <jmg@funkthat.com> wrote: > I'm about to commit a change to sha256 to speed it up, but the cost > of that speed up is an increase in code/data size from just under 1k > to almost 9k (as measured on amd64)... this increase is from unrolling > a loop.. > > Maybe we should have a global kernel option, SMALL_KERNEL, or something > similar that can be used to shrink code size for those that are trying > to build small embedded devices... > > Or do we already have this option, but I just don't know about it? > > I know 8k isn't much, but, a billion here and a billion there and pretty > soon you're talking about real money.. :) > Comments? > > It is very nice that you care about this. I am just not really sure that for such small numbers the extra data size matters much. The downside, as you can imagine, is now having to make sure that lint kernels do not trip on some "unused" warning. Cheers Luigi -- > John-Mark Gurney Voice: +1 415 225 5579 > > "All that I will do, has been done, All that I have, has not." > _______________________________________________ > freebsd-arch@freebsd.org <javascript:;> mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org<javascript:;> > " > -- -----------------------------------------+------------------------------- Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL +39-050-2211611 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -----------------------------------------+-------------------------------
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