> Von: Darrick J. Wong [darrick.wong@xxxxxxxxxx]
> Gesendet: Montag, 10. Juli 2017 18:51
> An: Markus Stockhausen
> Cc: 'linux-xfs@xxxxxxxxxxxxxxx'
> Betreff: Re: XFS hang - 4.4.73 longterm
>
> >On Sun, Jul 09, 2017 at 05:01:25PM +0000, Markus Stockhausen wrote:
> >
> > ...
> > Not good news. Finally I disabled SEEK support in nfsd by partially
> > reverting 3.18 patch 24bab491220faa446d94 "NFSD: Implement SEEK".
> > While before NFS/XFS crashed with active VM snapshots and heavy disk
> > writes after minutes it now runs for 2 days of intensive testing
> > without errors.
> >
> > At least now I have full discard support in side VMs (via hole
> > punching of disk files).
>
> I'd advise you to set an extent size hint to reduce fragmentation, the
> same as we tell everyone else. :)
Hehe. Since the days of the memory allocation errors and the need for
periodical drop caches we have an eye on it.
> I'd also advise you not to punch too many holes in the VM files because
> that increases extent map overhead. There's also an unfortunate design
> problem in the in-memory extent map -- all the extents have to fit in a
> single chunk of memory -- and punching a lot of small holes when memory
> is tight can lead to allocation failures.
Thanks for sharing that info. Do you (XFS developers) plan an overhaul
of that design or will it be enough to simply add RAM to the storage?
Markus
> ..
.
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