Felix Fietkau 010589e2bc skb: avoid unnecessary reallocations in __skb_cow ... [ Upstream commit 617c8c1123 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-06-10 00:36:15 +09:00
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acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-05-05 10:06:06 -07:00
asm-generic	asm-generic: Use __BITS_PER_LONG in statfs.h	2012-04-30 12:55:15 -07:00
crypto	crypto: user - Fix lookup of algorithms with IV generator	2012-03-29 19:52:47 +08:00
drm	Merge branch 'exynos-drm-fixes' of git://git.infradead.org/users/kmpark/linux-samsung into drm-intel-fixes	2012-04-12 17:42:01 +01:00
keys
linux	skb: avoid unnecessary reallocations in __skb_cow	2012-06-10 00:36:15 +09:00
math-emu
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-05-14 11:23:37 -07:00
misc
mtd
net	ipv6: fix incorrect ipsec fragment	2012-06-10 00:36:15 +09:00
pcmcia
rdma	Merge branches 'cma', 'cxgb3', 'cxgb4', 'ehca', 'iser', 'mad', 'nes', 'qib', 'srp' and 'srpt' into for-next	2012-03-19 09:50:33 -07:00
rxrpc
scsi	[SCSI] libsas, libata: fix start of life for a sas ata_port	2012-04-23 12:11:47 +01:00
sound	ALSA: hda - hide HDMI/ELD printks unless snd.debug=2	2012-04-10 14:53:55 +02:00
target	target: Use array_zalloc for device_list	2012-03-15 19:15:51 -07:00
trace	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-04-04 10:04:42 -07:00
video	Merge branch 'platforms' of git://git.linaro.org/people/rmk/linux-arm	2012-03-27 18:17:02 -07:00
xen	xen: do not map the same GSI twice in PVHVM guests.	2012-06-01 15:18:25 +08:00
Kbuild