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Willem de Bruijn 9954729bc3 packet: rollover only to socket with headroom 
Only migrate flows to sockets that have sufficient headroom, where
sufficient is defined as having at least 25% empty space.

The kernel has three different buffer types: a regular socket, a ring
with frames (TPACKET_V[12]) or a ring with blocks (TPACKET_V3). The
latter two do not expose a read pointer to the kernel, so headroom is
not computed easily. All three needs a different implementation to
estimate free space.

Tested:
  Ran bench_rollover for 10 sec with 1.5 Mpps of single flow input.

  bench_rollover has as many sockets as there are NIC receive queues
  in the system. Each socket is owned by a process that is pinned to
  one of the receive cpus. RFS is disabled. RPS is enabled with an
  identity mapping (cpu x -> cpu x), to count drops with softnettop.

    lpbb5:/export/hda3/willemb# ./bench_rollover -r -l 1000 -s
    Press [Enter] to exit

    cpu         rx       rx.k     drop.k   rollover     r.huge   r.failed
      0         16         16          0          0          0          0
      1         21         21          0          0          0          0
      2    5227502    5227502          0          0          0          0
      3         18         18          0          0          0          0
      4    6083289    6083289          0    5227496          0          0
      5         22         22          0          0          0          0
      6         21         21          0          0          0          0
      7          9          9          0          0          0          0

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-13 15:42:59 -04:00
..
6lowpan 6lowpan: nhc: add other known rfc6282 compressions 2015-02-14 23:08:44 +01:00
9p 9p: patches for 4.1 merge window 2015-04-18 17:45:30 -04:00
802 net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
8021q vlan: implement ndo_get_iflink 2015-04-02 14:05:00 -04:00
appletalk net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
atm net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
ax25 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
batman-adv dev: introduce dev_get_iflink() 2015-04-02 14:04:59 -04:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
bridge switchdev: don't use anonymous union on switchdev attr/obj structs 2015-05-13 14:20:59 -04:00
caif net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
can net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
ceph net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
core flow_dissector: change port array into src, dst tuple 2015-05-13 15:19:47 -04:00
dcb net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
dccp inet: fix possible panic in reqsk_queue_unlink() 2015-04-24 11:39:15 -04:00
decnet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
dns_resolver
dsa switchdev: don't use anonymous union on switchdev attr/obj structs 2015-05-13 14:20:59 -04:00
ethernet flow_dissect: use programable dissector in skb_flow_dissect and friends 2015-05-13 15:19:47 -04:00
hsr net/hsr: Fix NULL pointer dereference and refcnt bugs when deleting a HSR interface. 2015-03-01 13:40:23 -05:00
ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
ipv4 ipv4: __ip_local_out_sk() is static 2015-05-13 15:21:33 -04:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
ipx net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
irda net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
iucv net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
key net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
l2tp net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
lapb lapb: move EXPORT_SYMBOL after functions. 2014-10-24 15:51:42 -04:00
llc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
mac802154 Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2015-05-09 15:51:00 -04:00
mpls mpls: Change reserved label names to be consistent with netbsd 2015-05-09 22:29:50 -04:00
netfilter net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
netlabel netlink: implement nla_put_in_addr and nla_put_in6_addr 2015-03-31 13:58:35 -04:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
netrom net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
nfc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
openvswitch openvswitch: Use eth_proto_is_802_3 2015-05-05 19:24:42 -04:00
packet packet: rollover only to socket with headroom 2015-05-13 15:42:59 -04:00
phonet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-05-13 14:31:43 -04:00
rfkill Last round of updates for net-next: 2015-02-04 14:57:45 -08:00
rose net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rxrpc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
sched tc: introduce Flower classifier 2015-05-13 15:19:48 -04:00
sctp net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
sunrpc svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures 2015-05-04 12:02:40 -04:00
switchdev switchdev: don't use anonymous union on switchdev attr/obj structs 2015-05-13 14:20:59 -04:00
tipc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
unix net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
vmw_vsock net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
wimax
wireless cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA 2015-05-06 15:50:02 +02:00
x25 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
xfrm net: make skb_dst_pop routine static 2015-05-12 23:19:49 -04:00
compat.c net: switch importing msghdr from userland to {compat_,}import_iovec() 2015-04-09 00:02:26 -04:00
Kconfig kconfig: use bool instead of boolean for type definition attributes 2015-01-07 13:08:04 +01:00
Makefile mpls: Refactor how the mpls module is built 2015-03-04 00:26:06 -05:00
socket.c net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
sysctl_net.c