all your slabs are belong to ram ?

[krautus at kr916.org]

Thank you very much, will do!
(and report back the results)

Regards and thanks for supporting,
Mike


On Tue, 6 Oct 2015 18:16:46 +0200
"Johannes Truschnigg" <johannes.truschnigg at geizhals.at> wrote:

> Am Di, 6.10.2015, 16:50 schrieb Darrick J. Wong:
> > On Tue, Oct 06, 2015 at 04:24:43PM +0200, krautus at kr916.org wrote:
> >> [...]
> >> So I'm asking you:
> >> 1. is there a way to force dentries and inodes to stay in ram ?
> >> 2. can I perhaps move dentries and inodes to a dedicated SSD ?
> >>
> >> I'm open to all possibilities, perhaps increase RAM ?
> >> Upgrade to Debian Jessie and 64 bit ?
> >
> > ISTR that kernel data such as slabs cannot live in highmem, which means
> > that
> > dentries and slab cannot live in highmem.  A 32bit kernel sets up ~900M of
> > low
> > memory and ~15G of highmem, which is probably why the kernel has to evict
> > things and why you see such problems.
> >
> > A 64bit kernel sets up all the memory as lowmem, so the kernel can use all
> > the
> > memory for stuff like that.  I'd give that a try first.
> 
> A few years back, we solved pretty much that exact same problem by
> switching the kernel to amd64, with all of userspace remaining i386. You
> should definitely try this.
> 
> -- 
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> Johannes Truschnigg
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