[CentOS] CentOS 4.4 not seeing all RAM

[Rodrigo Barbosa]

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Maybe the hugemem kernel ?

[]s

On Mon, Mar 05, 2007 at 11:51:15AM -0500, Drew Weaver wrote:
> Fedora has a PAE kernel which is useful in instances like this, what
> would be the CentOS alternative to that?
> 
> -Drew 
> 
> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of Kanwar Ranbir Sandhu
> Sent: Monday, March 05, 2007 11:47 AM
> To: CentOS mailing list
> Subject: [CentOS] CentOS 4.4 not seeing all RAM
> 
> Hi Everyone,
> 
> My server is only seeing 4.8 GB out of 6 GB available.  I don't know
> why.
> 
> I have a CentOS 4.4 x86_64 server running on a Tyan s2895 with 6 GB of
> RAM (two 1 GB sticks and 2 2 GB sticks).  I upgraded the RAM, powered up
> the server, and when CentOS was finished booting, checked the available
> RAM with free.   This is what it's reporting:
> 
>                  total           used            free     shared
> buffers     cached
> Mem:       4809064    4769492      39572          0     197156
> 3127704
> -/+ buffers/cache:    1444632    3364432
> Swap:      2064376        176    2064200
> 
> The BIOS sees all of the RAM.  In fact, it looks to me like the kernel
> knows 6 GB is available.  But, it is only using 4.8 GB because I see
> this in dmesg:
> 
> Memory: 4808464k/6291456k available (2106k kernel code, 0k reserved,
> 1299k data, 196k init)
> 
> What happened to the other 1 GB+ of RAM?
> 
> BTW, the server isn't running all the newest updates, but it is running
> the latest CentOS 4 kernel (2.6.9-42.0.10.ELsmp).
> 
> Regards,
> 
> Ranbir
> --
> Kanwar Ranbir Sandhu
> Linux 2.6.19-1.2911.fc6 i686 GNU/Linux
> 11:39:08 up 2 days, 10:28, 2 users, load average: 1.18, 0.64, 0.60 
> 
> 
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- -- 
Rodrigo Barbosa
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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