Re: OSD deadlock with cephfs client and OSD on same machine

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On Tue, May 29, 2012 at 11:59 PM, Amon Ott <a.ott@xxxxxxxxxxxx> wrote:
> AFAIR, when the deadlocks came, there were some GB of the 12 GB RAM still
> unused, not even for caching. But it might be a problem with low memory,
> because we are running with 32 Bit.
>
> Would it be possible to preallocate a significant amount of RAM for the
> purpose of syncing? I would not mind reserving a few 100 MB for that, but
> deadlocks must not happen in any case. Can the size of the journal give a
> hint on how much is needed?

The code & complexity overhead of managing that reserved buffer has so
far prevented that approach from being really adopted, anywhere in the
Linux kernel community, as far as I know.
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