Date: Mon, 28 Feb 2005 15:19:35 -0700 From: Scott Long <scottl@samsco.org> To: Wes Peters <wes@softweyr.com> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 machdep.c src/sys/kern kern_mib.c src/sys/sys sysctl.h systm.h Message-ID: <422398F7.6010004@samsco.org> In-Reply-To: <200502281359.42589.wes@softweyr.com> References: <200502282142.j1SLgvhh067909@repoman.freebsd.org> <200502281359.42589.wes@softweyr.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Wes Peters wrote: > On Monday 28 February 2005 01:42 pm, Wes Peters wrote: > >>wes 2005-02-28 21:42:57 UTC >> >> FreeBSD src repository >> >> Modified files: >> sys/i386/i386 machdep.c >> sys/kern kern_mib.c >> sys/sys sysctl.h systm.h >> Log: >> Add a sysctl that records the amount of physical memory in the machine. > > > In case you're wondering why anyone would want this, vs. the already > existing hw.physmem, consider: > > hw.physmem: 526737408 > hw.usermem: 509272064 > hw.realmem: 535691264 > > The difference between 'realmem' and 'physmem' should always be the same for > a given device, unless BIOS settings have altered the memory map somehow. > We use this as a quick check to verify the BIOS settings haven't been > altered (at least enough to change the memory map). You'd be astonished > how much the physmem setting can bounce around on supposedly identical > hardware. > So how does this interact with the PCI memory hole at the upper end of the 4GB boundary? Scott
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?422398F7.6010004>