Curious, you seem to hit an old alloc_pages limit()... (MAX_ORDER allocation)
Your root node has 2^18 = 262144 pointers of 8 bytes -> 2097152 bytes (+ header -> 4194304 bytes)
But since following commit, we should use vmalloc() so this PAGE_SIZE<<10) limit
should not anymore be applied.
Could you do a "cat /proc/vmallocinfo" just to check your big tnodes are vmalloced() ?
commit 15be75cdb5db442d0e33d37b20832b88f3ccd383
Author: Stephen Hemminger <shemminger@vyatta.com>
Date: Thu Apr 10 02:56:38 2008 -0700
IPV4: fib_trie use vmalloc for large tnodes
Use vmalloc rather than alloc_pages to avoid wasting memory.
The problem is that tnode structure has a power of 2 sized array,
plus a header. So the current code wastes almost half the memory
allocated because it always needs the next bigger size to hold
that small header.
This is similar to an earlier patch by Eric, but instead of a list
and lock, I used a workqueue to handle the fact that vfree can't
be done in interrupt context.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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