Eric Dumazet d2cf43674e tcp: speedup tcp_fixup_rcvbuf() ... tcp_fixup_rcvbuf() contains a loop to estimate initial socket rcv space needed for a given mss. With large MTU (like 64K on lo), we can loop ~500 times and consume a lot of cpu cycles. perf top of 200 concurrent netperf -t TCP_CRR 5.62% netperf [kernel.kallsyms] [k] tcp_init_buffer_space 1.71% netperf [kernel.kallsyms] [k] _raw_spin_lock 1.55% netperf [kernel.kallsyms] [k] kmem_cache_free 1.51% netperf [kernel.kallsyms] [k] tcp_transmit_skb 1.50% netperf [kernel.kallsyms] [k] tcp_ack Lets use a 100% factor, and remove the loop. 100% is needed anyway for tcp_adv_win_scale=1 default value, and is also the maximum factor. Refs: commit b49960a05e ("tcp: change tcp_adv_win_scale and tcp_rmem[2]") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-05-16 15:19:45 -07:00
..
9p	Lots of virtio work which wasn't quite ready for last merge window. Plus	2013-05-02 14:14:04 -07:00
802	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-22 20:32:51 -04:00
8021q	net: vlan,ethtool: netdev_features_t is more than 32 bit	2013-05-02 13:58:12 -04:00
appletalk	appletalk: info leak in ->getname()	2013-04-25 01:47:58 -04:00
atm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
ax25	ax25: fix info leak via msg_name in ax25_recvmsg()	2013-04-07 16:28:00 -04:00
batman-adv	batman-adv: reorder clean up routine in order to avoid race conditions	2013-05-09 12:39:45 +02:00
bluetooth	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
bridge	bridge: fix race with topology change timer	2013-05-03 16:08:58 -04:00
caif	caif: Remove bouncing address for Daniel Martensson	2013-04-23 13:25:51 -04:00
can	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
ceph	libceph: use slab cache for osd client requests	2013-05-02 11:58:41 -05:00
core	ipv6: do not clear pinet6 field	2013-05-11 16:26:38 -07:00
dcb	rtnetlink: Remove passing of attributes into rtnl_doit functions	2013-03-22 10:31:16 -04:00
dccp	tcp: Remove TCPCT	2013-03-17 14:35:13 -04:00
decnet	decnet: remove duplicated include from dn_table.c	2013-04-07 17:12:01 -04:00
dns_resolver	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2012-12-16 15:40:50 -08:00
dsa	dsa: fix freeing of sparse port allocation	2013-03-25 12:23:41 -04:00
ethernet	net: add ETH_P_802_3_MIN	2013-03-28 01:20:42 -04:00
ieee802154	ieee802154/nl-mac.c: make some MLME operations optional	2013-04-08 12:00:16 -04:00
ipv4	tcp: speedup tcp_fixup_rcvbuf()	2013-05-16 15:19:45 -07:00
ipv6	xfrm6: release dev before returning error	2013-05-11 17:40:15 -07:00
ipx	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
irda	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-05-01 14:08:52 -07:00
iucv	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-22 20:32:51 -04:00
key	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec	2013-03-27 14:07:04 -04:00
l2tp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-07 18:37:01 -04:00
lapb	net/lapb: remove depends on CONFIG_EXPERIMENTAL	2013-01-11 11:40:01 -08:00
llc	llc: Fix missing msg_namelen update in llc_ui_recvmsg()	2013-04-07 16:28:01 -04:00
mac80211	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem	2013-04-24 10:54:20 -04:00
mac802154	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-30 03:55:20 -04:00
netfilter	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
netlabel	netlabel: fix build problems when CONFIG_IPV6=n	2013-03-08 11:33:51 -05:00
netlink	netlink: kconfig: move mmap i/o into netlink kconfig	2013-05-01 15:02:42 -04:00
netrom	netrom: info leak in ->getname()	2013-04-25 01:47:58 -04:00
nfc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-30 03:55:20 -04:00
openvswitch	openvswitch: Remove unneeded ovs_netdev_get_ifindex()	2013-04-30 00:19:11 -04:00
packet	packet: tpacket_v3: do not trigger bug() on wrong header status	2013-05-03 16:10:33 -04:00
phonet	rtnetlink: Remove passing of attributes into rtnl_doit functions	2013-03-22 10:31:16 -04:00
rds	net/rds: zero last byte for strncpy	2013-03-08 00:35:44 -05:00
rfkill	Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next	2013-04-22 14:58:14 -04:00
rose	rose: fix info leak via msg_name in rose_recvmsg()	2013-04-07 16:28:02 -04:00
rxrpc	Driver core patches for 3.9-rc1	2013-02-21 12:05:51 -08:00
sched	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-05-01 14:08:52 -07:00
sctp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-05-01 14:08:52 -07:00
sunrpc	Merge branch 'for-3.10' of git://linux-nfs.org/~bfields/linux	2013-05-10 09:28:55 -07:00
tipc	tipc: potential divide by zero in tipc_link_recv_fragment()	2013-05-06 16:16:52 -04:00
unix	af_unix: fix a fatal race with bit fields	2013-05-01 15:13:49 -04:00
vmw_vsock	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-30 03:55:20 -04:00
wimax
wireless	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
x25	x25: use proc_remove_subtree()	2013-04-09 14:13:35 -04:00
xfrm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2013-05-02 14:53:12 -07:00
compat.c
Kconfig	netlink: kconfig: move mmap i/o into netlink kconfig	2013-05-01 15:02:42 -04:00
Makefile	VSOCK: Introduce VM Sockets	2013-02-10 19:41:08 -05:00
nonet.c
socket.c	Merge git://git.infradead.org/users/eparis/audit	2013-05-11 14:29:11 -07:00
sysctl_net.c	user_ns: get rid of duplicate code in net_ctl_permissions	2012-11-18 20:32:45 -05:00