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SubjectRe: Memory issues with Opteron 6220
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Le jeudi 09 février 2012 à 09:33 +0100, Ingo Molnar a écrit :
> * Anders Ossowicki <aowi@novozymes.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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