Re: Memory not being reported
From: David Ronis
Date: Sun Jan 25 2009 - 12:13:46 EST
I don't think this is a 64bit capable box. Nonetheless, there are only
4G of memory, not more, and I still see 3G of it.
David
On Sat, 2009-01-24 at 02:37 -0600, Robert Hancock wrote:
> David Ronis wrote:
> > I'm running 2.6.28.1 on an i686 (slackware-12.1 for the most part) box.
> > I recently added some extra memory, expanding from 2Gb to 4. Everything
> > works as expected except that not all of the memory seems to be seen.
> >
> > free returns:
> >
> > total used free shared buffers
> > cached
> > Mem: 3374860 2099504 1275356 0 86612
> > 1032024
> > -/+ buffers/cache: 980868 2393992
> > Swap: 497972 0 497972
> >
> >
> > and cat /proc/meminfo gives:
> >
> > MemTotal: 3374860 kB
> > MemFree: 1199184 kB
> > Buffers: 86816 kB
> > Cached: 1036240 kB
> > SwapCached: 0 kB
> > Active: 1375864 kB
> >
> > etc.
> >
> > On the other hand, user-space tools like lshw show the 4 1Gb DIMMS as
> > does the BIOS configuration boot menu.
> >
> > One suspicion is that the configure option CONFIG_HIGHMEM4G=y
> > should be unset and the CONFIG_HIGHMEM64G should be.
>
> Yes, it should be. However, if your chipset doesn't support remapping
> memory above the 4GB mark (some don't, and this is needed in this case
> because various IO areas use up some of the address space below 4GB)
> then it won't be possible to make use of any of that RAM.
>
> Note that when running with more than 4GB of RAM it's generally
> preferable to run a 64-bit kernel if the machine supports it.
>
> >
> > Any help would be appreciated, as would a separate CC since I don't
> > subscribe to the list.
> >
> > Thanks in advance
> >
> > David
> >
>
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