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f07d960df3
linux/net
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Eric Dumazet f07d960df3 tcp: avoid frag allocation for small frames 
tcp_sendmsg() uses select_size() helper to choose skb head size when a
new skb must be allocated.

If GSO is enabled for the socket, current strategy is to force all
payload data to be outside of headroom, in PAGE fragments.

This strategy is not welcome for small packets, wasting memory.

Experiments show that best results are obtained when using 2048 bytes
for skb head (This includes the skb overhead and various headers)

This patch provides better len/truesize ratios for packets sent to
loopback device, and reduce memory needs for in-flight loopback packets,
particularly on arches with big pages.

If a sender sends many 1-byte packets to an unresponsive application,
receiver rmem_alloc will grow faster and will stop queuing these packets
sooner, or will collapse its receive queue to free excess memory.

netperf -t TCP_RR results are improved by ~4 %, and many workloads are
improved as well (tbench, mysql...)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-11-29 13:17:03 -05:00
..
9p net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
802 net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
8021q net: introduce and use netdev_features_t for device features sets 2011-11-16 17:43:10 -05:00
appletalk net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
atm atm: br2684: Avoid alignment issues 2011-11-29 00:28:06 -05:00
ax25 NET: AX.25: Check ioctl arguments to avoid overflows further down the road. 2011-11-29 00:23:12 -05:00
batman-adv batman-adv: Fix range check for expected packets 2011-11-20 13:08:35 +01:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-11-22 14:05:46 -05:00
bridge net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
caif caif: fix endian conversion in cffrml_transmit() 2011-11-21 16:46:24 -05:00
can can: remove references to berlios mailinglist 2011-10-17 19:22:46 -04:00
ceph net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
core flow_dissector: use a 64bit load/store 2011-11-29 13:17:03 -05:00
dcb net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-26 14:47:03 -05:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-26 14:47:03 -05:00
dns_resolver
dsa dsa: Move switch drivers to new directory drivers/net/dsa 2011-11-29 00:21:36 -05:00
econet net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ethernet net: don't clear IFF_XMIT_DST_RELEASE in ether_setup 2011-09-15 14:49:44 -04:00
ieee802154 net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ipv4 tcp: avoid frag allocation for small frames 2011-11-29 13:17:03 -05:00
ipv6 net: dont call jump_label_dec from irq context 2011-11-29 00:26:25 -05:00
ipx net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
irda irttp: Use kmemdup rather than duplicating its implementation 2011-11-21 15:02:17 -05:00
iucv net: more accurate skb truesize 2011-10-13 16:05:07 -04:00
key net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
l2tp l2tp: fix l2tp_udp_recv_core() 2011-11-08 13:59:44 -05:00
lapb wan: make LAPB callbacks const 2011-09-16 19:20:20 -04:00
llc net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
mac80211 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2011-11-28 14:11:18 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-26 14:47:03 -05:00
netlabel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-26 14:47:03 -05:00
netlink af_unix: dont send SCM_CREDENTIALS by default 2011-09-28 13:29:50 -04:00
netrom NET: NETROM: Fix formatting. 2011-11-29 00:23:13 -05:00
nfc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-11-22 14:05:46 -05:00
packet packet: Add needed_tailroom to packet_sendmsg_spkt 2011-11-18 14:37:10 -05:00
phonet Phonet: set the pipe handle using setsockopt 2011-11-18 14:37:40 -05:00
rds rds: drop "select LLIST" 2011-11-14 00:10:50 -05:00
rfkill Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-11-22 14:05:46 -05:00
rose net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
rxrpc RxRPC: Use kmemdup rather than duplicating its implementation 2011-11-21 15:02:36 -05:00
sched net: Add queue state xoff flag for stack 2011-11-29 12:46:19 -05:00
sctp net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
sunrpc net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
tipc net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
unix af_unix: dont send SCM_CREDENTIALS by default 2011-09-28 13:29:50 -04:00
wanrouter wanrouter: Remove kernel_lock annotations 2011-11-07 13:27:30 -05:00
wimax net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
wireless Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2011-11-28 14:11:18 -05:00
x25 Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-26 14:47:03 -05:00
compat.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
Kconfig bql: Byte queue limits 2011-11-29 12:46:19 -05:00
Makefile NFC: add nfc subsystem core 2011-07-05 15:26:57 -04:00
nonet.c
socket.c net: add network priority cgroup infrastructure (v4) 2011-11-22 15:22:23 -05:00
sysctl_net.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00