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Eric Dumazet 95bd09eb27 tcp: TSO packets automatic sizing 
After hearing many people over past years complaining against TSO being
bursty or even buggy, we are proud to present automatic sizing of TSO
packets.

One part of the problem is that tcp_tso_should_defer() uses an heuristic
relying on upcoming ACKS instead of a timer, but more generally, having
big TSO packets makes little sense for low rates, as it tends to create
micro bursts on the network, and general consensus is to reduce the
buffering amount.

This patch introduces a per socket sk_pacing_rate, that approximates
the current sending rate, and allows us to size the TSO packets so
that we try to send one packet every ms.

This field could be set by other transports.

Patch has no impact for high speed flows, where having large TSO packets
makes sense to reach line rate.

For other flows, this helps better packet scheduling and ACK clocking.

This patch increases performance of TCP flows in lossy environments.

A new sysctl (tcp_min_tso_segs) is added, to specify the
minimal size of a TSO packet (default being 2).

A follow-up patch will provide a new packet scheduler (FQ), using
sk_pacing_rate as an input to perform optional per flow pacing.

This explains why we chose to set sk_pacing_rate to twice the current
rate, allowing 'slow start' ramp up.

sk_pacing_rate = 2 * cwnd * mss / srtt

v2: Neal Cardwell reported a suspect deferring of last two segments on
initial write of 10 MSS, I had to change tcp_tso_should_defer() to take
into account tp->xmit_size_goal_segs

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Van Jacobson <vanj@google.com>
Cc: Tom Herbert <therbert@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2013-08-29 15:50:06 -04:00
..
9p 9p: client: remove unused code and any reference to "cancelled" function 2013-07-30 15:54:28 -07:00
bluetooth Bluetooth: Remove unneeded flag 2013-06-23 00:23:53 +01:00
caif caif: Remove my bouncing email address. 2013-04-23 13:25:51 -04:00
irda include: Convert ethernet mac address declarations to use ETH_ALEN 2013-08-02 12:33:54 -07:00
iucv af_iucv: fix recvmsg by replacing skb_pull() function 2013-04-08 17:16:57 -04:00
netfilter netfilter: add SYNPROXY core/target 2013-08-28 00:27:54 +02:00
netns Revert "net: sctp: convert sctp_checksum_disable module param into sctp sysctl" 2013-08-09 13:09:41 -07:00
nfc NFC: netlink: Rename CMD_FW_UPLOAD to CMD_FW_DOWNLOAD 2013-07-31 01:19:43 +02:00
phonet net: remove my future former mail address 2012-06-17 16:29:38 -07:00
sctp net: sctp: reorder sctp_globals to reduce cacheline usage 2013-08-29 14:55:54 -04:00
tc_act
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act_api.h net: Remove extern from include/net/ scheduling prototypes 2013-07-31 17:24:22 -07:00
addrconf.h addrconf.h: Remove extern function prototypes 2013-07-31 17:50:01 -07:00
af_ieee802154.h
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af_rxrpc.h af_rxrpc.h: Remove extern from function prototypes 2013-07-31 17:50:01 -07:00
af_unix.h af_unix: improve STREAM behavior with fragmented memory 2013-08-10 01:16:44 -07:00
af_vsock.h VSOCK: Move af_vsock.h and vsock_addr.h to include/net 2013-07-27 22:14:06 -07:00
ah.h ipsec: update MAX_AH_AUTH_LEN to support sha512 2011-01-13 21:48:25 -08:00
arp.h arp/neighbour.h: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
atmclip.h atm: clip: Use device neigh support on top of "arp_tbl". 2011-11-30 18:51:03 -05:00
ax25.h ax25.h: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
ax88796.h
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busy_poll.h net: rename busy poll MIB counter 2013-08-09 11:39:08 -07:00
cfg80211-wext.h cfg80211: remove unused wext handler exports 2011-08-08 14:26:29 -04:00
cfg80211.h Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-08-12 14:45:06 -04:00
checksum.h checksum: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
cipso_ipv4.h cipso: handle CIPSO options correctly when NetLabel is disabled 2012-06-01 14:18:29 -04:00
cls_cgroup.h cls_cgroup.h netprio_cgroup.h: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
codel.h codel: refine one condition to avoid a nul rec_inv_sqrt 2012-08-10 16:52:54 -07:00
compat.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
datalink.h
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dcbevent.h dcb: Add stub routines for !CONFIG_DCB 2011-10-06 15:49:51 -04:00
dcbnl.h net/dcb: Add an optional max rate attribute 2012-04-05 05:08:04 -04:00
dn.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
dn_dev.h
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dn_fib.h decnet: Parse netlink attributes on our own 2013-03-22 10:31:16 -04:00
dn_neigh.h
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dn_nsp.h
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dn_route.h decnet: use correct RCU API to deref sk_dst_cache field 2013-01-28 00:15:27 -05:00
dsa.h dsa: Include linux/if_ether.h to fix build error 2011-12-01 11:41:06 -05:00
dsfield.h ipv6: Optimize ipv6_change_dsfield(). 2013-01-09 23:59:53 -08:00
dst.h Fix dst_neigh_lookup/dst_neigh_lookup_skb return value handling bug 2013-03-15 09:06:58 -04:00
dst_ops.h net: Fix warnings in dst_ops.h 2012-07-19 10:43:03 -07:00
esp.h
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ethoc.h
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fib_rules.h fib_rules: reorder struct fib_rules fields 2013-08-03 11:53:54 -07:00
firewire.h firewire net, ipv4 arp: Extend hardware address and remove driver-level packet inspection. 2013-03-26 12:32:13 -04:00
flow.h ipv4: Add FLOWI_FLAG_KNOWN_NH 2012-10-08 17:42:36 -04:00
flow_keys.h flow_keys: include thoff into flow_keys for later usage 2013-03-20 12:14:36 -04:00
garp.h garp: remove last synchronize_rcu() call 2011-05-12 17:46:56 -04:00
gen_stats.h net_sched: add 64bit rate estimators 2013-06-11 02:51:03 -07:00
genetlink.h genl: Allow concurrent genl callbacks. 2013-04-25 01:43:15 -04:00
gre.h net: gre: move GSO functions to gre_offload 2013-07-03 14:37:39 -07:00
gro_cells.h gro: Fix kcalloc argument order 2013-01-27 22:46:33 -05:00
icmp.h ipv4: fix error handling in icmp_protocol. 2013-02-22 15:10:18 -05:00
ieee80211_radiotap.h mac80211: add radiotap flag and handling for 5/10 MHz 2013-07-16 09:58:05 +03:00
ieee802154.h 6LoWPAN: add fragmentation support 2011-11-14 00:19:42 -05:00
ieee802154_netdev.h ieee802154/nl-mac.c: make some MLME operations optional 2013-04-08 12:00:16 -04:00
if_inet6.h ipv6: resend MLD report if a link-local address completes DAD 2013-06-28 21:19:17 -07:00
inet6_connection_sock.h ipv6: Add helper inet6_csk_update_pmtu(). 2012-07-16 03:44:56 -07:00
inet6_hashtables.h ipv6: use a stronger hash for tcp 2013-02-21 18:15:58 -05:00
inet_common.h net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN) 2012-07-19 11:02:03 -07:00
inet_connection_sock.h tcp: Tail loss probe (TLP) 2013-03-12 08:30:34 -04:00
inet_ecn.h net: Correct comparisons and calculations using skb->tail and skb-transport_header 2013-05-28 23:49:07 -07:00
inet_frag.h net: frag, fix race conditions in LRU list maintenance 2013-05-06 11:06:51 -04:00
inet_hashtables.h hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
inet_sock.h ipv4: remove is_data also from ip_options documentation. 2013-06-12 03:13:50 -07:00
inet_timewait_sock.h hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
inetpeer.h ipv4: Maintain redirect and PMTU info in struct rtable again. 2012-07-10 22:40:14 -07:00
ip.h ipv4: Add a socket release callback for datagram sockets 2013-01-21 14:17:05 -05:00
ip6_checksum.h ipv6: move csum_ipv6_magic() and udp6_csum_init() into static library 2013-01-08 17:56:10 -08:00
ip6_fib.h ipv6: prevent fib6_run_gc() contention 2013-08-01 14:16:20 -07:00
ip6_route.h ipv6: handle Redirect ICMP Message with no Redirected Header option 2013-08-22 20:08:21 -07:00
ip6_tunnel.h ip6tnl: add x-netns support 2013-08-15 01:00:20 -07:00
ip_fib.h ipv4: remove fib_update_nh_saddrs() declaration. 2013-07-02 00:33:52 -07:00
ip_tunnels.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-08-16 15:37:26 -07:00
ip_vs.h ipvs: add sync_persist_mode flag 2013-06-26 18:01:46 +09:00
ipcomp.h
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ipconfig.h
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ipv6.h net: Add NEXTHDR_SCTP to ipv6.h 2013-08-23 16:43:08 -07:00
ipx.h net: Remove __KERNEL__ cpp checks from include/net 2011-04-24 10:54:56 -07:00
iw_handler.h Fix common misspellings 2011-03-31 11:26:23 -03:00
lapb.h lapb: Neaten debugging 2012-05-17 18:45:20 -04:00
lib80211.h hostap: Don't use create_proc_read_entry() 2013-04-29 15:41:56 -04:00
llc.h llc: Remove stray reference to sysctl_llc_station_ack_timeout. 2012-09-17 13:13:24 -04:00
llc_c_ac.h
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llc_c_ev.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
llc_c_st.h
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llc_conn.h
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llc_if.h
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llc_pdu.h net: delete all instances of special processing for token ring 2012-05-15 20:14:35 -04:00
llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h
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llc_sap.h
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mac80211.h Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-08-12 14:45:06 -04:00
mac802154.h mac802154: add wpan device-class support 2012-06-26 21:06:11 -07:00
mip6.h
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mld.h
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mrp.h net/802: Implement Multiple Registration Protocol (MRP) 2013-02-10 20:37:22 -05:00
ndisc.h ndisc: Add missing inline to ndisc_addr_option_pad 2013-07-31 15:18:17 -07:00
neighbour.h arp/neighbour.h: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
net_namespace.h net: split rt_genid for ipv4 and ipv6 2013-07-31 14:56:36 -07:00
net_ratelimit.h net: Kill ratelimit.h dependency in linux/net.h 2011-05-27 13:41:33 -04:00
netdma.h
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netevent.h ipv6 netevent: Remove old_neigh from netevent_redirect. 2013-01-14 15:04:59 -05:00
netlabel.h userns: Convert the audit loginuid to be a kuid 2012-09-17 18:08:54 -07:00
netlink.h netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
netprio_cgroup.h cls_cgroup.h netprio_cgroup.h: Remove extern from function prototypes 2013-07-31 17:50:02 -07:00
netrom.h hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
nexthop.h
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nl802154.h
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p8022.h
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ping.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-06-05 16:37:30 -07:00
pkt_cls.h net: Remove extern from include/net/ scheduling prototypes 2013-07-31 17:24:22 -07:00
pkt_sched.h net: Remove extern from include/net/ scheduling prototypes 2013-07-31 17:24:22 -07:00
protocol.h net: Remove code duplication between offload structures 2012-11-15 17:39:51 -05:00
psnap.h
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raw.h
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rawv6.h ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
red.h net_sched: red: Make minor corrections to comments 2012-04-16 23:53:11 -04:00
regulatory.h regulatory: use RCU to protect last_request 2013-01-03 13:01:30 +01:00
request_sock.h net: remove a stale comment for dl_next 2013-04-22 15:55:48 -04:00
rose.h rose: Add length checks to CALL_REQUEST parsing 2011-03-27 17:59:04 -07:00
route.h ipv4: avoid a test in ip_rt_put() 2012-11-03 14:59:04 -04:00
rtnetlink.h rtnetlink: Remove passing of attributes into rtnl_doit functions 2013-03-22 10:31:16 -04:00
sch_generic.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-08-16 15:37:26 -07:00
scm.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-04-22 20:32:51 -04:00
secure_seq.h net: defer net_secret[] initialization 2013-04-29 15:14:02 -04:00
slhc_vj.h
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snmp.h net: avoid reloads in SNMP_UPD_PO_STATS 2012-08-06 13:40:47 -07:00
sock.h tcp: TSO packets automatic sizing 2013-08-29 15:50:06 -04:00
stp.h
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tcp.h tcp: TSO packets automatic sizing 2013-08-29 15:50:06 -04:00
tcp_memcontrol.h cgroup: pass struct mem_cgroup instead of struct cgroup to socket memcg 2012-04-10 10:04:07 -07:00
tcp_states.h
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timewait_sock.h [PATCH] tcp: Cache inetpeer in timewait socket, and only when necessary. 2012-06-09 14:56:12 -07:00
transp_v6.h transp_v6.h: style neatening 2013-06-04 16:43:42 -07:00
udp.h pktgen: Add UDPCSUM flag to support UDP checksums 2013-07-27 22:16:36 -07:00
udplite.h net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
vsock_addr.h VSOCK: Move af_vsock.h and vsock_addr.h to include/net 2013-07-27 22:14:06 -07:00
vxlan.h vxlan: Factor out vxlan send api. 2013-08-20 00:15:43 -07:00
wext.h
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wimax.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
wpan-phy.h mac802154: monitor device support 2012-05-16 15:17:08 -04:00
x25.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
x25device.h
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xfrm.h xfrm: constify mark argument of xfrm_find_acq() 2013-08-05 11:13:53 +02:00