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From: Tim Allingham <deserted@westnet.com.au>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Linux too damn slow if memory > 3GB
Date: Sun, 29 Jul 2007 09:39:50 +1000	[thread overview]
Message-ID: <1185665991.14058.2.camel@localhost> (raw)
In-Reply-To: <8a0c7af10707281628p61dac9f1x89aef31a6f2b71df@mail.gmail.com>

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On Sat, 2007-07-28 at 20:28 -0300, Daniel van Ham Colchete wrote:
> Hello everyone!!!
> 
> May be somebody can shed some light here... I'm building a server here
> with 4GB of RAM memory. The fact is, if I boot with mem=3072M
> everything goes as fast as it should but I'm not using 1GB of memory.
> If I don't put the mem option, Linux will see 4GB of memory available
> but it will be damn slow (really). 
> 
> To make Linux recognize 4 gigs of memory I had to activate
> HIGHMEM=64GB, otherwise it only recognizes 3279MB (but it is fast).
> 
> My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is
> Intel. I'm running Gentoo at 32bits mode and the kernel version is
> 2.6.20-gentoo-r8.
> 
> Any lights would be very appreciated.
> 
> Best regards,
> Daniel Colchete

I don't actually run 4GB of RAM in any of my intel systems, so I can't
comment from experience, however my suspicion would be the overhead
introduced from PAE, which (at least on older kernels) requires some
processing overhead to utilise.  Are you able to try a 64-bit install to
determine if this is the case?

Regards,

Tim Allingham
Email:Tim@DataFirst-IT.com.au

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  reply	other threads:[~2007-07-28 23:46 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-28 23:28 [gentoo-user] Linux too damn slow if memory > 3GB Daniel van Ham Colchete
2007-07-28 23:39 ` Tim Allingham [this message]
2007-07-28 23:52   ` Tim Allingham
2007-07-29  0:10     ` Daniel van Ham Colchete
2007-07-29  0:12 ` Stroller
2007-07-30 15:59   ` Daniel van Ham Colchete
2007-07-30 17:08     ` Steen Eugen Poulsen
2007-07-30 17:28       ` Developer Edoceo
2007-07-30 18:24         ` Daniel van Ham Colchete
2007-08-01 14:17 ` Duane Griffin

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