netdev - Re: mac80211 truesize bugs

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Message-Id: <1209894754.6210.58.camel@johannes.berg>
Date:	Sun, 04 May 2008 11:52:34 +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 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.

johannes

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