John Heffner 326f36e9e7 [TCP]: receive buffer growth limiting with mixed MTU ... This is a patch for discussion addressing some receive buffer growing issues. This is partially related to the thread "Possible BUG in IPv4 TCP window handling..." last week. Specifically it addresses the problem of an interaction between rcvbuf moderation (receiver autotuning) and rcv_ssthresh. The problem occurs when sending small packets to a receiver with a larger MTU. (A very common case I have is a host with a 1500 byte MTU sending to a host with a 9k MTU.) In such a case, the rcv_ssthresh code is targeting a window size corresponding to filling up the current rcvbuf, not taking into account that the new rcvbuf moderation may increase the rcvbuf size. One hunk makes rcv_ssthresh use tcp_rmem[2] as the size target rather than rcvbuf. The other changes the behavior when it overflows its memory bounds with in-order data so that it tries to grow rcvbuf (the same as with out-of-order data). These changes should help my problem of mixed MTUs, and should also help the case from last week's thread I think. (In both cases though you still need tcp_rmem[2] to be set much larger than the TCP window.) One question is if this is too aggressive at trying to increase rcvbuf if it's under memory stress. Orignally-from: John Heffner <jheffner@psc.edu> Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2005-11-10 17:11:48 -08:00
..
ipvs	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
netfilter	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
af_inet.c	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
ah4.c	[CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL	2005-09-01 17:44:29 -07:00
arp.c	[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl	2005-10-03 14:35:55 -07:00
datagram.c	[NET]: Fix sparse warnings	2005-08-29 16:01:32 -07:00
devinet.c	[IPV4]: Fix setting broadcast for SIOCSIFNETMASK	2005-10-26 01:20:21 -02:00
esp4.c	[IPSEC] Fix block size/MTU bugs in ESP	2005-10-10 21:11:34 -07:00
fib_frontend.c	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
fib_hash.c	[NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers	2005-08-29 16:11:18 -07:00
fib_lookup.h	[IPV4]: Prepare FIB core for RCU.	2005-08-29 16:08:31 -07:00
fib_rules.c	[NETLINK]: Correctly set NLM_F_MULTI without checking the pid	2005-06-18 22:54:12 -07:00
fib_semantics.c	[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl	2005-10-03 14:35:55 -07:00
fib_trie.c	[IPV4]: Kill redundant rcu_dereference on fa_info	2005-10-26 00:25:03 -02:00
icmp.c	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
igmp.c	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
inet_connection_sock.c	[TCP/DCCP]: Randomize port selection	2005-11-05 21:23:15 -02:00
inet_diag.c	[NETLINK]: Make netlink_callback->done() optional	2005-11-10 02:26:40 +01:00
inet_hashtables.c	[NET]: Introduce inet_connection_sock	2005-08-29 15:43:19 -07:00
inet_timewait_sock.c	[TWSK]: Grab the module refcount for timewait sockets	2005-10-10 21:25:23 -07:00
inetpeer.c	[PATCH] timer initialization cleanup: DEFINE_TIMER	2005-09-09 14:03:48 -07:00
ip_forward.c	[IPV4]: Remove some dead code from ip_forward()	2005-08-29 16:03:06 -07:00
ip_fragment.c	[IPV4]: Reassembly trim not clearing CHECKSUM_HW	2005-09-06 15:51:48 -07:00
ip_gre.c	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
ip_input.c	[NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers	2005-08-29 16:11:18 -07:00
ip_options.c	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
ip_output.c	[IPV4]: Fix ip_queue_xmit identity increment for TSO packets	2005-11-08 09:41:56 -08:00
ip_sockglue.c	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
ipcomp.c	[CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL	2005-09-01 17:44:29 -07:00
ipconfig.c	[NET]: fix-up schedule_timeout() usage	2005-09-12 14:15:34 -07:00
ipip.c	[NET]: fix oops after tunnel module unload	2005-07-30 17:46:44 -07:00
ipmr.c	[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl	2005-10-03 14:35:55 -07:00
Kconfig	[INET_DIAG]: Move the tcp_diag interface to the proper place	2005-08-29 15:57:54 -07:00
Makefile	[INET_DIAG]: Move the tcp_diag interface to the proper place	2005-08-29 15:57:54 -07:00
multipath_drr.c	[IPV4]: possible cleanups	2005-08-29 15:33:20 -07:00
multipath_random.c	[IPV4]: Multipath modules need a license to prevent kernel tainting.	2005-06-13 14:29:06 -07:00
multipath_rr.c	[IPV4]: Multipath modules need a license to prevent kernel tainting.	2005-06-13 14:29:06 -07:00
multipath_wrandom.c	[NET]: kfree cleanup	2005-11-08 09:41:34 -08:00
multipath.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
netfilter.c	[NETFILTER]: Move reroute-after-queue code up to the nf_queue layer.	2005-08-29 15:36:19 -07:00
proc.c	[NET]: Wider use of for_each_*cpu()	2005-10-25 23:54:01 -02:00
protocol.c	[TCP]: Move the tcp sock states to net/tcp_states.h	2005-08-29 15:41:54 -07:00
raw.c	[PATCH] raw_sendmsg DoS on 2.6	2005-09-19 18:45:42 -07:00
route.c	[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl	2005-10-03 14:35:55 -07:00
syncookies.c	[NET]: Fix sparse warnings	2005-08-29 16:01:32 -07:00
sysctl_net_ipv4.c	[TCP]: Appropriate Byte Count support	2005-11-10 17:09:53 -08:00
tcp_bic.c	[TCP]: add tcp_slow_start helper	2005-11-10 17:07:24 -08:00
tcp_cong.c	[TCP]: Appropriate Byte Count support	2005-11-10 17:09:53 -08:00
tcp_diag.c	[INET_DIAG]: Move the tcp_diag interface to the proper place	2005-08-29 15:57:54 -07:00
tcp_highspeed.c	[TCP]: add tcp_slow_start helper	2005-11-10 17:07:24 -08:00
tcp_htcp.c	[TCP]: add tcp_slow_start helper	2005-11-10 17:07:24 -08:00
tcp_hybla.c	[TCP]: fix congestion window update when using TSO deferal	2005-11-10 16:53:30 -08:00
tcp_input.c	[TCP]: receive buffer growth limiting with mixed MTU	2005-11-10 17:11:48 -08:00
tcp_ipv4.c	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
tcp_minisocks.c	[TCP]: Appropriate Byte Count support	2005-11-10 17:09:53 -08:00
tcp_output.c	[TCP]: fix congestion window update when using TSO deferal	2005-11-10 16:53:30 -08:00
tcp_scalable.c	[TCP]: add tcp_slow_start helper	2005-11-10 17:07:24 -08:00
tcp_timer.c	[ICSK]: Move TCP congestion avoidance members to icsk	2005-08-29 15:56:18 -07:00
tcp_vegas.c	[TCP]: add tcp_slow_start helper	2005-11-10 17:07:24 -08:00
tcp_westwood.c	[INET_DIAG]: Rename tcp_diag.[ch] to inet_diag.[ch]	2005-08-29 15:57:48 -07:00
tcp.c	[TCP]: Appropriate Byte Count support	2005-11-10 17:09:53 -08:00
udp.c	[NET]: Detect hardware rx checksum faults correctly	2005-11-10 13:01:24 -08:00
xfrm4_input.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
xfrm4_output.c	[IPSEC]: Add XFRM_STATE_NOPMTUDISC flag	2005-06-20 13:21:43 -07:00
xfrm4_policy.c	[IPSEC]: Store idev entries	2005-05-03 16:27:10 -07:00
xfrm4_state.c	[IPV4]: possible cleanups	2005-08-29 15:33:20 -07:00
xfrm4_tunnel.c	[NET]: Make ipip/ip6_tunnel independant of XFRM	2005-07-19 14:03:34 -07:00