linux-kernel - Re: Memory issues with Opteron 6220

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Date:	Thu, 09 Feb 2012 10:08:49 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, jk@...ozymes.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>
Subject: Re: Memory issues with Opteron 6220

Le jeudi 09 février 2012 à 09:33 +0100, Ingo Molnar a écrit :
> * Anders Ossowicki <aowi@...ozymes.com> wrote:
> 
> > Hey,
> > 
> > We're seeing unexpected slowdowns and other memory issues with a new system.
> > Enough to render it unusable. For example:
> > 
> > Error: open3: fork failed: Cannot allocate memory
> > 
> > at times where there's no real memory pressure:
> >                    total       used       free     shared    buffers     cached
> >       Mem:     132270720  131942388     328332          0     299768  103334420
> >       -/+ buffers/cache:   28308200  103962520
> >       Swap:      7811068      13760    7797308
> >
> > [...]
> 
> > The system is a Dell Poweredge R715, with two eight-core 
> > Opteron 6220 processors and 128G of memory. We have several 
> > similar systems, such as the one this should replace: R715, 
> > 2x8 core Opteron 6140, 128G memory, and they do not exhibit 
> > any similar symptoms.
> 
> 130 MB of RAM visible to Linux isn't the expected bootup default 
> indeed. Around 130 *GB* would be expected ...

Not sure what you mean, I see 128GB in the "free" output, as expected.

I dont understand why there are 4 nodes, given "The system is a Dell
Poweredge R715, with two eight-core Opteron 6220".

Or are each 6220 splitted on two nodes ?


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