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aha/net/ipv4
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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.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -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
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.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
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