Refer the below link for VM info http://www.skynet.ie/~mel/projects/vm/guide/html/understand/ --- Lei Yang <leiyang@xxxxxxxxxxxx> wrote: > So you mean that it is mapped to a 512MB ram instead > of more than 1GB? I thought there is some trick > there to map kernel uniquely to 1GB space. > > -----Original Message----- > From: Lukas Ruf [mailto:ruf@xxxxxxxxx] > Sent: Thursday, July 15, 2004 12:19 PM > To: Lei Yang > Cc: PLEASE REPLY TO THE LIST; Kernel Newbies > Subject: Re: Physical memory > > > Please do NOT top-post! See > <http://www.rawip.org/style.html>. > > > Lei Yang <leiyang@xxxxxxxxxxxx> [2004-07-15 > 18:08]: > > > > > > Lei Yang <leiyang@xxxxxxxxxxxx> [2004-07-15 > 17:46]: > > > > > > > > Have a very basic question here, but it is > kind of annoying me. The > > > > kernel virtual area ( 3-4GB in virtual > address) maps to the first > > > > 1GB of physical RAM. But it is so common that > we only have a machine > > > > of 256MB/512MB etc. What is going on? > > > > > > > > > > I assume: > > > - your machine has only 512MB of real memory. > > > - the mapping, i.e. the address translation, is > carried out by the > > > memory management unit in accordance to the > configuration > > > page table directories. > > > > > > Do you mean that physical memory is NOT real > memory? > > > > well, what do you mean then? > > I assume you box has 512MB installed, right? So it > IS real memory. > > wbr, > Lukas > -- > Lukas Ruf | Wanna know anything about raw > | > <http://www.lpr.ch> | IP? -> <http://www.rawip.org> > | > eMail Style Guide: > <http://www.rawip.org/style.html>| > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > ________________________________________________________________________ Yahoo! India Careers: Over 65,000 jobs online Go to: http://yahoo.naukri.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
