Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages_nodemask+0x1d4/0x68c()

Eric Dumazet
2012-10-04T17:17:35Z

On Thu, 2012-10-04 at 19:09 +0200, Maxime Bizon wrote:

> yes, on ipv6 forward path the default NET_SKB_PAD is too small, so each
> packet forwarded has its headroom expanded, it is then recycled and gets
> its original default headroom back, then it gets forwarded,
> expanded, ...

Hmm, this sounds bad (especially without recycle)

Might I assume NET_SKB_PAD is 32 on this arch ?

We might adjust NET_SKB_PAD to avoid all these memory copies...