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Date:	Sun, 04 May 2008 13:25:55 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, mb@...sch.de,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs

On Sun, 2008-05-04 at 11:52 +0200, Johannes Berg wrote:
> On Sun, 2008-05-04 at 17:44 +0800, Herbert Xu wrote:
> > On Sun, May 04, 2008 at 11:14:49AM +0200, Johannes Berg wrote:
> > >
> > > I just re-did the test, and I definitely need 29 more bytes on, for
> > > example, the IPv6 autodiscovery packets and ICMP packets generated with
> > > ping(8). Some of them even need additional tailroom.
> > 
> > Could you find out the code path that created the skb in the
> > kernel so we can see why there isn't enough head room?
> 
> Yeah I was just considering putting a stacktrace into the skb when it's
> allocated. Haven't done, lunchtime now.

http://johannes.sipsolutions.net/patches/kernel/all/2008-05-04-11%3a23/027-skb-alloc-stackdump.patch

will report results after kernel rebuild.

johannes

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