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| author | Felix Fietkau <nbd@openwrt.org> | 2012-05-29 05:35:08 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-29 23:30:08 +0200 |
| commit | 617c8c11236716dcbda877e764b7bf37c6fd8063 (patch) | |
| tree | 78211c03e4e80eb1ea448c45139ce07534ccd238 /drivers/net/ethernet/rdc/r6040.c | |
| parent | net: sh_eth: fix the rxdesc pointer when rx descriptor empty happens (diff) | |
| download | linux-617c8c11236716dcbda877e764b7bf37c6fd8063.tar.xz linux-617c8c11236716dcbda877e764b7bf37c6fd8063.zip | |
skb: avoid unnecessary reallocations in __skb_cow
At the beginning of __skb_cow, headroom gets set to a minimum of
NET_SKB_PAD. This causes unnecessary reallocations if the buffer was not
cloned and the headroom is just below NET_SKB_PAD, but still more than the
amount requested by the caller.
This was showing up frequently in my tests on VLAN tx, where
vlan_insert_tag calls skb_cow_head(skb, VLAN_HLEN).
Locally generated packets should have enough headroom, and for forward
paths, we already have NET_SKB_PAD bytes of headroom, so we don't need to
add any extra space here.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/rdc/r6040.c')
0 files changed, 0 insertions, 0 deletions