Why do I get OOM kills when I copy a large amount of data over Network File System?

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When the size of the data to be copied exceeds the size of physical memory, oom-killer starts randomly killing processes. This can be fixed by:

sysctl -w vm.lower_zone_protection 100

When lower_zone_protection is set to 100, it increases the free page threshold by 100 thereby starting page reclamation earlier and preventing NFS (Network ...

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