Messages in this thread | | | Date | Tue, 12 Jul 2016 13:28:12 +0200 | From | Matthias Dahl <> | Subject | Re: Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage) |
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Hello Michal...
On 2016-07-12 11:50, Michal Hocko wrote:
> This smells like file pages are stuck in the writeback somewhere and > the > anon memory is not reclaimable because you do not have any swap device.
Not having a swap device shouldn't be a problem -- and in this case, it would cause even more trouble as in disk i/o.
What could cause the file pages to get stuck or stopped from being written to the disk? And more importantly, what is so unique/special about the Intel Rapid Storage that it happens (seemingly) exclusively with that and not the the normal Linux s/w raid support?
Also, if the pages are not written to disk, shouldn't something error out or slow dd down? Obviously dd is capable of copying zeros a lot faster than they could ever be written to disk -- and still, it works just fine without dm-crypt in-between. It is only when dm-crypt /is/ involved, that the memory gets filled up and things get out of control.
Thanks, Matthias
-- Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu services: custom software [desktop, mobile, web], server administration
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