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Eric Dumazet 98e09386c0 tcp: tsq: restore minimal amount of queueing 
After commit c9eeec26e3 ("tcp: TSQ can use a dynamic limit"), several
users reported throughput regressions, notably on mvneta and wifi
adapters.

802.11 AMPDU requires a fair amount of queueing to be effective.

This patch partially reverts the change done in tcp_write_xmit()
so that the minimal amount is sysctl_tcp_limit_output_bytes.

It also remove the use of this sysctl while building skb stored
in write queue, as TSO autosizing does the right thing anyway.

Users with well behaving NICS and correct qdisc (like sch_fq),
can then lower the default sysctl_tcp_limit_output_bytes value from
128KB to 8KB.

This new usage of sysctl_tcp_limit_output_bytes permits each driver
authors to check how their driver performs when/if the value is set
to a minimum of 4KB.

Normally, line rate for a single TCP flow should be possible,
but some drivers rely on timers to perform TX completion and
too long TX completion delays prevent reaching full throughput.

Fixes: c9eeec26e3 ("tcp: TSQ can use a dynamic limit")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Sujith Manoharan <sujith@msujith.org>
Reported-by: Arnaud Ebalard <arno@natisbad.org>
Tested-by: Sujith Manoharan <sujith@msujith.org>
Cc: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2013-11-14 16:25:14 -05:00
..
9p file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
802 mrp: add periodictimer to allow retries when packets get lost 2013-09-23 16:53:52 -04:00
8021q vlan: Implement vlan_dev_get_egress_qos_mask as an inline. 2013-11-11 00:42:07 -05:00
appletalk net: proc_fs: trivial: print UIDs as unsigned int 2013-08-15 14:37:46 -07:00
atm net: always pass struct netdev_notifier_info to netdevice notifiers 2013-05-28 21:58:54 -07:00
ax25 ax25: cleanup a range test 2013-10-18 13:56:07 -04:00
batman-adv batman-adv: generalize batman-adv icmp packet handling 2013-10-23 17:03:47 +02:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-11-08 09:03:10 -05:00
bridge bridge: Fix memory leak when deleting bridge with vlan filtering enabled 2013-11-14 16:16:34 -05:00
caif caif: use pskb_put() instead of reimplementing its functionality 2013-11-07 19:28:59 -05:00
can net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
ceph net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
core core/dev: do not ignore dmac in dev_forward_skb() 2013-11-14 02:39:53 -05:00
dcb
…
dccp ipv4: introduce new IP_MTU_DISCOVER mode IP_PMTUDISC_INTERFACE 2013-11-05 21:52:27 -05:00
decnet netfilter: pass hook ops to hookfn 2013-10-14 11:29:31 +02:00
dns_resolver net: strict_strtoul is obsolete, use kstrtoul instead 2013-07-12 16:09:14 -07:00
dsa net: dsa: inherit addr_assign_type along with dev_addr 2013-09-03 20:57:49 -04:00
ethernet ethernet: use likely() for common Ethernet encap 2013-09-30 21:52:53 -07:00
hsr net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0) 2013-11-03 23:20:14 -05:00
ieee802154 6lowpan: release device on error path 2013-11-07 19:11:13 -05:00
ipv4 tcp: tsq: restore minimal amount of queueing 2013-11-14 16:25:14 -05:00
ipv6 ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh 2013-11-11 01:25:28 -05:00
ipx net: proc_fs: trivial: print UIDs as unsigned int 2013-08-15 14:37:46 -07:00
irda Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-11-13 17:40:34 +09:00
iucv net: delete __cpuinit usage from all net files 2013-07-14 19:36:58 -04:00
key xfrm: Guard IPsec anti replay window against replay bitmap 2013-09-17 12:17:10 +02:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-23 16:49:34 -04:00
lapb net/lapb: re-send packets on timeout 2013-09-23 16:52:45 -04:00
llc llc: Use normal etherdevice.h tests 2013-09-03 22:34:47 -04:00
mac80211 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-11-08 09:03:10 -05:00
mac802154 6lowpan: set and use mac_len for mac header length 2013-10-30 17:18:46 -04:00
mpls ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-11-13 17:40:34 +09:00
netlabel inet: includes a sock_common in request_sock 2013-10-10 00:08:07 -04:00
netlink net: netlink: filter particular protocols from analyzers 2013-09-06 14:43:48 -04:00
netrom net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
nfc NFC: Fix SE API related sparse warning 2013-10-07 14:18:44 +02:00
openvswitch Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jesse/openvswitch 2013-11-04 16:25:04 -05:00
packet net: packet: use reciprocal_divide in fanout_demux_hash 2013-08-29 16:43:29 -04:00
phonet net: proc_fs: trivial: print UIDs as unsigned int 2013-08-15 14:37:46 -07:00
rds inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
rfkill net: rfkill: gpio: add ACPI support 2013-10-28 15:05:25 +01:00
rose net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
rxrpc net: misc: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
sched net_sched: tbf: support of 64bit rates 2013-11-09 14:53:37 -05:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-04 13:48:30 -05:00
sunrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-11-13 17:40:34 +09:00
tipc tipc: reassembly failures should cause link reset 2013-11-07 18:30:11 -05:00
unix net: unix: inherit SOCK_PASS{CRED, SEC} flags from socket to fix race 2013-10-19 18:50:15 -04:00
vmw_vsock Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-08-16 15:37:26 -07:00
wimax net: misc: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
wireless Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-11-08 09:03:10 -05:00
x25 net: x25: Fix dead URLs in Kconfig 2013-10-29 17:35:17 -04:00
xfrm net: move pskb_put() to core code 2013-11-07 19:28:58 -05:00
Kconfig net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0) 2013-11-03 23:20:14 -05:00
Makefile net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0) 2013-11-03 23:20:14 -05:00
compat.c net: heap overflow in __audit_sockaddr() 2013-10-03 16:05:14 -04:00
nonet.c
…
socket.c net: heap overflow in __audit_sockaddr() 2013-10-03 16:05:14 -04:00
sysctl_net.c net: Update the sysctl permissions handler to test effective uid/gid 2013-10-07 15:57:56 -04:00