On Thu, 26 Nov 2020 13:52:46 +0100 Sven Eckelmann wrote: > It was observed that sending data via batadv over vxlan (on top of > wireguard) reduced the performance massively compared to raw ethernet or > batadv on raw ethernet. A check of perf data showed that the > vxlan_build_skb was calling all the time pskb_expand_head to allocate > enough headroom for: > > min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len > + VXLAN_HLEN + iphdr_len; > > But the vxlan_config_apply only requested needed headroom for: > > lowerdev->hard_header_len + VXLAN6_HEADROOM or VXLAN_HEADROOM > > So it completely ignored the needed_headroom of the lower device. The first > caller of net_dev_xmit could therefore never make sure that enough headroom > was allocated for the rest of the transmit path. > > Cc: Annika Wickert <annika.wick...@exaring.de> > Signed-off-by: Sven Eckelmann <s...@narfation.org>
Applied both, thanks!
