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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