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Eric Dumazet 69b08f62e1 net: use bigger pages in __netdev_alloc_frag 
We currently use percpu order-0 pages in __netdev_alloc_frag
to deliver fragments used by __netdev_alloc_skb()

Depending on NIC driver and arch being 32 or 64 bit, it allows a page to
be split in several fragments (between 1 and 8), assuming PAGE_SIZE=4096

Switching to bigger pages (32768 bytes for PAGE_SIZE=4096 case) allows :

- Better filling of space (the ending hole overhead is less an issue)

- Less calls to page allocator or accesses to page->_count

- Could allow struct skb_shared_info futures changes without major
  performance impact.

This patch implements a transparent fallback to smaller
pages in case of memory pressure.

It also uses a standard "struct page_frag" instead of a custom one.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 19:29:35 -04:00
..
9p net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
802
8021q vlan: add helper which can be called to see if device is used by vlan 2012-08-24 13:46:39 -04:00
appletalk userns: Print out socket uids in a user namespace aware fashion. 2012-08-14 21:48:06 -07:00
atm net🏧fix up ENOIOCTLCMD error handling 2012-08-31 16:14:33 -04:00
ax25 userns: Convert net/ax25 to use kuid_t where appropriate 2012-08-14 21:49:42 -07:00
batman-adv batman-adv: Start new development cycle 2012-08-23 14:20:23 +02:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-09-15 11:43:53 -04:00
bridge netdev: make address const in device address management 2012-09-19 16:35:22 -04:00
caif caif: move the dereference below the NULL test 2012-09-10 16:13:31 -04:00
can netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
ceph libceph: avoid truncation due to racing banners 2012-08-21 15:55:27 -07:00
core net: use bigger pages in __netdev_alloc_frag 2012-09-27 19:29:35 -04:00
dcb netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
dccp dccp: fix info leak via getsockopt(DCCP_SOCKOPT_CCID_TX_INFO) 2012-08-15 21:36:31 -07:00
decnet netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
dns_resolver
dsa
ethernet ipx: move peII functions 2012-07-19 10:48:00 -07:00
ieee802154 net/ieee802154/6lowpan.c: Remove unecessary semicolon 2012-09-18 16:08:19 -04:00
ipv4 tcp: Remove unused parameter from tcp_v4_save_options 2012-09-27 19:20:26 -04:00
ipv6 ipv6: gre: remove ip6gre_header_parse() 2012-09-27 18:49:22 -04:00
ipx userns: Print out socket uids in a user namespace aware fashion. 2012-08-14 21:48:06 -07:00
irda netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
iucv net: remove skb_orphan_try() 2012-06-15 15:30:15 -07:00
key netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
l2tp l2tp: fix compile error when CONFIG_IPV6=m and CONFIG_L2TP=y 2012-09-21 12:06:46 -04:00
lapb
llc llc: Remove stray reference to sysctl_llc_station_ack_timeout. 2012-09-17 13:13:24 -04:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-09-15 11:43:53 -04:00
mac802154 mac802154: sparse warnings: make symbols static 2012-07-12 07:54:45 -07:00
netfilter netfilter: nfnetlink_queue: add NFQA_CAP_LEN attribute 2012-09-24 15:10:29 +02:00
netlabel netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
netlink netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
netrom netrom: copy_datagram_iovec can fail 2012-09-04 12:57:35 -04:00
nfc netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
openvswitch net/openvswitch/vport.c: Remove unecessary semicolon 2012-09-18 16:08:19 -04:00
packet netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
phonet netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
rds rds: Don't disable BH on BH context 2012-08-22 22:52:04 -07:00
rfkill Revert "rfkill: remove dead code" 2012-08-21 20:50:25 +02:00
rose
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-07-10 23:56:33 -07:00
sched pkt_sched: Fix warning false positives. 2012-09-27 18:35:47 -04:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-09-15 11:43:53 -04:00
sunrpc NFS client bugfixes for Linux 3.6 2012-09-13 09:04:13 +08:00
tipc net/tipc/name_table.c: Remove unecessary semicolon 2012-09-18 16:08:19 -04:00
unix af_unix: old_cred is surplus 2012-09-17 13:00:13 -04:00
wanrouter wanmain: comparing array with NULL 2012-07-24 13:55:21 -07:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-09-15 11:43:53 -04:00
x25 net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-09-15 11:43:53 -04:00
compat.c net: Fix references to out-of-scope variables in put_cmsg_compat() 2012-07-22 17:50:49 -07:00
Kconfig net: Add INET dependency on aes crypto for the sake of TCP fastopen. 2012-09-04 14:20:14 -04:00
Makefile
nonet.c
socket.c net: remove sk_init() helper 2012-09-27 18:42:00 -04:00
sysctl_net.c