From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface,
 PERCPU: allocation failed
Date: Thu, 19 May 2011 03:51:11 -0400 (EDT)
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From: Denys Fedoryshchenko <denys@visp.net.lb>
Date: Thu, 19 May 2011 09:35:29 +0300

> I am not sure it is a bug, but it looks i had free memory(the box had
> 8GB free), and lowmem too, also i will try to enable there 64bit
> kernel at evening.

It's not free memory, you ran out of per-cpu chunks which are allocated
in fixed virtual region(s).