On Thu, Mar 1, 2012 at 7:22 PM, Thomas Nikolajsen <thomas.nikolaj...@mail.dk> wrote: >>So my question is: can I install DragonFlyBSD on my PC with 48 MB >>RAM? And if it is possible, then what is the right way to do it? > > Yes that should be possible; > you will have to setup a swap partition (e.g. 256MB) on your HD and > enable it (swapon), before running the installer. > > 48MB is a rather low mem system, so you might not be able to run the > installer, > but you can do manual install of DragonFly, that way you will also learn the > steps, > see /README on install media; please use UFS; not HAMMER, it needs more mem. > (http://gitweb.dragonflybsd.org/dragonfly.git/blob/HEAD:/nrelease/root/README) > > 48MB will not get you running big programs, only do small things, > but it should work, see > http://www.shiningsilence.com/dbsdlog/2012/02/28/9296.html. > > As some developers has expressed in this thread problems triggered by such > a small amount of mem might not get 1st priority from them, but just file a > bug if you do see such. > > -thomas >
One of our developers tested with snapshots; it looks like the DMA reserve commit is the one that made DF no longer run w/ 48MB. That makes sense, as 16MB of physical memory is locked up by that commit. You should be able to boot with a loader variable set to reserve less physical memory. We someday need a better physmem allocator; the 16MB reserve is a good step, but a low-fragmentation allocator would be better. -- vs;
