From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bin Ren <bin.ren@gmail.com>
Subject: Re: bug: slab corruption (net backend?)
Date: Mon, 11 Jul 2005 15:29:10 +0100
Message-ID: <8ae780250507110729777901bd@mail.gmail.com>
References: <20050707094132.GA29339@bytesex>
	<E1DqTLV-00068D-00@mta1.cl.cam.ac.uk> <20050707113514.GA30556@bytesex>
	<f9095f4e739734ec5b54796ebe6f31ae@cl.cam.ac.uk>
	<20050707122242.GA31229@bytesex> <87br5ehi15.fsf@bytesex.org>
	<42CD52F4.2010407@us.ibm.com> <20050711132535.GB13297@bytesex>
	<a776c5dde83e89353dc30ce76e4c67a6@cl.cam.ac.uk>
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To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: Gerd Knorr <kraxel@suse.de>, xen-devel@lists.xensource.com, Steven Hand <Steven.Hand@cl.cam.ac.uk>
List-Id: xen-devel@lists.xenproject.org

Not sure whether this is related or not. Interdomain NFS stops working
with the latest xen-unstable. Haven't taken a closer look though. Last
time the same thing happened was when checksum offloading was added.

- Bin

On 7/11/05, Keir Fraser <Keir.Fraser@cl.cam.ac.uk> wrote:
>=20
> On 11 Jul 2005, at 14:25, Gerd Knorr wrote:
>=20
> >> Can you disable tcp checksum offload (ethtool -K tx off) and see
> >> if you can reproduce this problem?
> >
> > Never seen that again since I've turned off CONFIG_SLAB_DEBUG,
> > which seems to be incompatible with the page mapping the xen
> > backend drivers do.
>=20
> Well, I'm not 100% sure of this. It looks like guard bytes aren;t
> placed around slab allocations when slab object size is near a power of
> two. But if guard header/footers are added to our skbuff data objects
> then yes: that will be broken for xen netback.
>=20
>   -- Keir
>=20
>=20
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