Re: page allocation failures on osd nodes

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Sorry, I have written too less yesterday because of being sleepy.
That`s obviously a cache pressure since dropping caches resulted in
disappearance of this errors for a long period. I`m not very familiar
with kernel memory mechanisms, but shouldn`t kernel try to allocate
memory on the second node if this not prohibited by process` cpuset
first and only then report allocation failure(as can be seen only node
0 involved in the failures)? I really have no idea where
numa-awareness may be count in case of osd daemons.

On Fri, Jan 25, 2013 at 2:42 AM, Andrey Korolyov <andrey@xxxxxxx> wrote:
> Hi,
>
> Those traces happens only constant high constant writes and seems to
> be very rarely. OSD processes do not consume more memory after this
> event and peaks are not distinguishable by monitoring. I have able to
> catch it having four-hour constant writes on the cluster.
>
> http://xdel.ru/downloads/ceph-log/allocation-failure/
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