Re: problems with e1000 and jumboframes
From: Evgeniy Polyakov
Date: Thu Aug 03 2006 - 09:57:21 EST
On Thu, Aug 03, 2006 at 03:48:39PM +0200, Arnd Hannemann (arnd@xxxxxxxxxx) wrote:
> im running vanilla 22.214.171.124 and if i try to set the mtu of my e1000 nic
> to 9000 bytes, page allocation failures occur (see below).
> However the box is a VIA Epia MII12000 with 1 GB of Ram and 1 GB of swap
> enabled, so there should be plenty of memory available. HIGHMEM support
> is off. The e1000 nic seems to be an 82540EM, which to my knowledge
> should support jumboframes.
But it does not support splitting them into page sized chunks, so it
requires the whole jumbo frame allocation in one contiguous chunk, 9k
will be transferred into 16k allocation (order 3), since SLAB uses
> However I can't always reproduce this on a freshly booted system, so
> someone else may be the culprit and leaking pages?
You will almost 100% reproduce it after "find / > /dev/null".
> Any ideas how to debug this?
It can not be debugged - you have cought a memory fragmentation problem,
which is quite common.
> > kswapd0: page allocation failure. order:3, mode:0x20
e1000 tries to allocate 3-order pages atomically?
Well, that's wrong.
> Arnd Hannemann
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/