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da882c1f2e
linux_dsm_epyc7002/net/ipv6
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Eric Dumazet da882c1f2e tcp: sk_add_backlog() is too agressive for TCP 
While investigating TCP performance problems on 10Gb+ links, we found a
tcp sender was dropping lot of incoming ACKS because of sk_rcvbuf limit
in sk_add_backlog(), especially if receiver doesnt use GRO/LRO and sends
one ACK every two MSS segments.

A sender usually tweaks sk_sndbuf, but sk_rcvbuf stays at its default
value (87380), allowing a too small backlog.

A TCP ACK, even being small, can consume nearly same truesize space than
outgoing packets. Using sk_rcvbuf + sk_sndbuf as a limit makes sense and
is fast to compute.

Performance results on netperf, single flow, receiver with disabled
GRO/LRO : 7500 Mbits instead of 6050 Mbits, no more TCPBacklogDrop
increments at sender.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Cc: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-23 22:28:28 -04:00
..
netfilter net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
addrconf_core.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
addrconf.c net ipv6: Convert addrconf to use register_net_sysctl 2012-04-20 21:22:29 -04:00
addrlabel.c rtnetlink: Compute and store minimum ifinfo dump size 2011-06-09 20:38:07 -07:00
af_inet6.c sock: Introduce named constants for sk_reuse 2012-04-21 15:52:25 -04:00
ah6.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
anycast.c ipv6: Remove never used function inet6_ac_check(). 2012-02-01 16:14:17 -05:00
datagram.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
esp6.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-05-05 14:59:02 -07:00
exthdrs_core.c net/ipv6/exthdrs_core.c: Checkpatch cleanups 2012-04-02 04:33:46 -04:00
exthdrs.c net/ipv6/exthdrs.c: Strict PadN option checking 2012-04-12 17:36:44 -04:00
fib6_rules.c net/ipv6/fib6_rules.c: Checkpatch cleanup 2012-04-02 04:33:46 -04:00
icmp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-10 14:30:45 -04:00
inet6_connection_sock.c tcp: bind() use stronger condition for bind_conflict 2012-04-14 15:28:55 -04:00
inet6_hashtables.c net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-06 18:33:19 -07:00
ip6_fib.c ipv6: fix problem with expired dst cache 2012-04-13 12:58:29 -04:00
ip6_flowlabel.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
ip6_input.c ipv6: Add fragment reporting to ipv6_skip_exthdr(). 2011-12-03 09:35:10 -08:00
ip6_output.c ipv6: fix incorrent ipv6 ipsec packet fragment 2012-03-20 05:39:34 -04:00
ip6_tunnel.c ip6_tunnel: dont drop packet but consume it 2012-04-19 14:23:55 -04:00
ip6mr.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-10 14:30:45 -04:00
ipcomp6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ipv6_sockglue.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
Kconfig ipv6: ip6mr: support multiple tables 2010-05-11 14:40:55 +02:00
Makefile [IPV6] MROUTE: Support multicast forwarding. 2008-04-05 22:33:38 +09:00
mcast.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-10 14:30:45 -04:00
mip6.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
ndisc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-15 13:19:04 -04:00
netfilter.c 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
proc.c ipv6: fix per device IP snmp counters 2012-01-17 23:56:18 -05:00
protocol.c net: add __rcu annotations to protocol 2010-10-27 11:37:31 -07:00
raw.c ipv6: Implement IPV6_UNICAST_IF socket option. 2012-02-08 15:52:45 -05:00
reassembly.c net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-15 13:19:04 -04:00
sit.c tunnel: implement 64 bits statistics 2012-04-14 14:47:05 -04:00
syncookies.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
sysctl_net_ipv6.c net: Delete all remaining instances of ctl_path 2012-04-20 21:22:30 -04:00
tcp_ipv6.c tcp: sk_add_backlog() is too agressive for TCP 2012-04-23 22:28:28 -04:00
tunnel6.c tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udp.c net: add a limit parameter to sk_add_backlog() 2012-04-23 22:28:28 -04:00
udplite.c 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
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c [IPSEC]: Make x->lastused an unsigned long 2008-01-28 14:53:52 -08:00
xfrm6_mode_transport.c [IPSEC]: Use IPv6 calling convention as the convention for x->mode->output 2007-10-10 16:55:54 -07:00
xfrm6_mode_tunnel.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_output.c xfrm6: remove unneeded NULL check in __xfrm6_output() 2012-02-01 02:52:48 -05:00
xfrm6_policy.c net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
xfrm6_state.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
xfrm6_tunnel.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00