There is a common problem that network hardware may require multi-page buffers, which we can't allocate (without swapping, which is not possible in the network stack) if memory is nearly full and fragmented. This case is similar but slightly different: the multi-page allocation is for a new socket for a TCP connection.
This is not a PowerPC-specific issue. (In fact POWER is much less likely to have this problem, as its usual page size is 64K.) Fundamentally this can't be solved, but I wonder whether the default value of vm.min_free_kbytes is too low. Ben. -- Ben Hutchings Life is like a sewer: what you get out of it depends on what you put into it.
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