Thanks for the detailed information. Best
--- On Fri, 4/10/09, Matthew Seaman <m.sea...@infracaninophile.co.uk> wrote: > From: Matthew Seaman <m.sea...@infracaninophile.co.uk> > Subject: Re: loader.conf > To: ipfr...@yahoo.com > Cc: "freebsd general questions" <freebsd-questions@freebsd.org> > Date: Friday, April 10, 2009, 9:03 AM > gahn wrote: > > Hi all: > > > > I have a machine with 2GB memory. in the file > loader.conf, there is a line: > > > > #hw.physmem="1G" # Limit > physical memory. See loader(8) > > > > Could I remove the "#" and change that to > "2G"? > > > > Interestingly, the sysctl indicates the parameter of > "hw.physmem" is not changeable. > > > > Any guru here give me some enlightenment? > > hw.physmem is a loader tunable: ie. you can only set it > from the boot > loader before the kernel is fully operational. Once the > kernel is running > it can't be altered. > > hw.physmem is designed to let you test running a kernel > with less RAM > than is physically installed in a machine. Not having to > pop the case > and physically pull memory sticks out can be pretty useful. > It's not of > general interest -- only for kernel and various other > software developers > in the main -- as the usual thing is to make use of all the > RAM you have > available or (in the case of 32bit machines) that the > system is capable of > addressing. > If hw.physmem is unset in loader.conf the kernel will > automatically use all > the memory available to it: this is the correct and > desirable behaviour for > the vast majority of systems. For a 2GB machine, that > means the system will > use all the RAM that's installed. > > Cheers, > > Matthew > > -- Dr Matthew J Seaman MA, D.Phil. 7 > Priory Courtyard > Flat 3 > PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate > Kent, CT11 > 9PW _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
