Lawrence Stewart 47f44cdd93 Some correctness and robustness fixes related to CUBIC's mean RTT estimate: ... - The mean RTT is updated at the end of each congestion epoch, but if we switch to congestion avoidance within the first epoch (e.g. if ssthresh was primed from the hostcache), we'll trigger a divide by zero panic in cubic_ack_received(). Set the mean to the min in cubic_record_rtt() if the mean is less than the min to ensure we have a sane mean for use in this situation. This fixes the panic reported by Nick Hibma. - Adjust conditions under which we update the mean RTT in cubic_post_recovery() to ensure a low latency path won't yield an RTT of less than 1. This avoids another potential divide by zero panic when running CUBIC in networks with sub-millisecond latencies. - Remove the "safety" assignment of min into mean when we don't update the mean because of failed conditions. The above change to the conditions for updating the mean ensures the safety issue is addressed and I feel it is better to keep our previous mean estimate around if we can't update than to revert to the min. - Initialise the mean RTT to 1 on connection startup to act as a safety belt if a situation we haven't considered and addressed with the above changes were to crop up in the wild. Sponsored by: FreeBSD Foundation Reported and tested by: Nick Hibma Discussed with: David Hayes <dahayes at swin edu au> MFC after: 5 weeks X-MFC with: r216114		2011-01-21 05:19:47 +00:00
..
cc	Some correctness and robustness fixes related to CUBIC's mean RTT estimate:	2011-01-21 05:19:47 +00:00
ipfw	Use a blocking malloc() to initialize the dummynet taskq.	2011-01-13 17:02:39 +00:00
libalias	Standardise all Swinburne related copyright/licence statements throughout the	2010-11-12 00:44:18 +00:00
accf_data.c
accf_dns.c
accf_http.c
cc.h	Make the CC framework more VIMAGE friendly by adding the machinery to allow	2010-11-16 09:34:31 +00:00
icmp6.h
icmp_var.h
if_atm.c	Bring back (most of) NATM to avoid further bitrot after r186119.	2010-12-15 22:58:45 +00:00
if_atm.h
if_ether.c	Un-break the build: use the correct format specifier for sizeof()	2011-01-12 23:07:51 +00:00
if_ether.h
igmp_var.h
igmp.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
igmp.h
in_cksum.c
in_debug.c	Add initial inet DDB support for show in_ifaddr and show sin commands which	2010-10-24 22:02:36 +00:00
in_gif.c
in_gif.h
in_mcast.c
in_pcb.c	Make sure to always do source address selection on	2011-01-08 22:33:46 +00:00
in_pcb.h
in_proto.c	Allow carp(4) to be loaded as a kernel module. Follow precedent set by	2010-08-11 00:51:50 +00:00
in_rmx.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
in_systm.h
in_var.h
in.c	Use time_uptime instead of non-monotonic time_second to drive ARP	2010-11-30 15:57:00 +00:00
in.h	Make the RPC specific __rpc_inet_ntop() and __rpc_inet_pton() general	2010-09-24 15:01:45 +00:00
ip6.h	Fix more continuous/contiguous typos (cf. r215955)	2010-11-27 21:51:39 +00:00
ip_carp.c	Redo r166423. It is important not only skip freeing multicast	2010-11-24 05:24:36 +00:00
ip_carp.h	Unbreak LINT by moving all carp hooks to net/if.c / netinet/ip_carp.h, with	2010-08-11 20:18:19 +00:00
ip_divert.c	Specify a CTLTYPE_FOO so that a future sysctl(8) change does not need	2011-01-18 21:14:13 +00:00
ip_divert.h
ip_dummynet.h
ip_ecn.c
ip_ecn.h
ip_encap.c
ip_encap.h
ip_fastfwd.c	Use correct field to track statistics counting error as bad header length.	2010-12-05 01:09:48 +00:00
ip_fw.h	The first customer of the SO_USER_COOKIE option:	2010-11-12 13:05:17 +00:00
ip_gre.c
ip_gre.h
ip_icmp.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
ip_icmp.h
ip_id.c
ip_input.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
ip_ipsec.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
ip_ipsec.h
ip_mroute.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
ip_mroute.h
ip_options.c	Use ifa_ifwithaddr_check() rather than ifa_ifwithaddr() as we are not	2010-10-14 12:32:49 +00:00
ip_options.h
ip_output.c	Try to catch a possible divide-by-zero as early as possible if "mtu" is 0	2010-12-31 21:47:11 +00:00
ip_var.h	MFp4 CH=183052 183053 183258:	2010-09-02 17:43:44 +00:00
ip.h
pim_var.h
pim.h
raw_ip.c	Specify a CTLTYPE_FOO so that a future sysctl(8) change does not need	2011-01-18 21:14:13 +00:00
sctp_asconf.c	Define and use SCTP_SSN_GE, SCTP_SSN_GT, SCTP_TSN_GE, SCTP_TSN_GT macros	2010-12-30 21:32:35 +00:00
sctp_asconf.h	Delay the assignment of a path for DATA chunk until they hit	2010-09-15 23:10:45 +00:00
sctp_auth.c	Fix a locking issue which shows up when the code is used	2010-09-19 11:42:16 +00:00
sctp_auth.h
sctp_bsd_addr.c	Code cleanup: Use LIST_FOREACH, LIST_FOREACH_SAFE, TAILQ_FOREACH,	2010-12-30 16:56:20 +00:00
sctp_bsd_addr.h
sctp_cc_functions.c	Cleanup the management of CC functions.	2011-01-19 22:10:35 +00:00
sctp_constants.h	Fix it so we align with new socket API draft for	2011-01-20 12:40:09 +00:00
sctp_crc32.c	Simplify sctp_delayed_cksum() a bit.	2010-11-14 14:37:20 +00:00
sctp_crc32.h	Fix the the SCTP_WITH_NO_CSUM option when used in combination with	2010-08-29 18:50:30 +00:00
sctp_dtrace_declare.h	Adds new dtrace for cwnd functions and lay's	2010-11-25 13:39:55 +00:00
sctp_dtrace_define.h	Adds new dtrace for cwnd functions and lay's	2010-11-25 13:39:55 +00:00
sctp_header.h
sctp_indata.c	Define and use SCTP_SSN_GE, SCTP_SSN_GT, SCTP_TSN_GE, SCTP_TSN_GT macros	2010-12-30 21:32:35 +00:00
sctp_indata.h
sctp_input.c	Bugfix: Make sure that the COMM_UP notificatin is delivered first also	2011-01-02 10:27:27 +00:00
sctp_input.h
sctp_lock_bsd.h
sctp_os_bsd.h	Fix typos.	2010-11-09 10:59:09 +00:00
sctp_os.h
sctp_output.c	Define and use SCTP_SSN_GE, SCTP_SSN_GT, SCTP_TSN_GE, SCTP_TSN_GT macros	2010-12-30 21:32:35 +00:00
sctp_output.h	Delay the assignment of a path for DATA chunk until they hit	2010-09-15 23:10:45 +00:00
sctp_pcb.c	Cleanup the management of CC functions.	2011-01-19 22:10:35 +00:00
sctp_pcb.h	Fix the switching on/off of CMT using sysctl and socket option.	2010-08-28 17:59:51 +00:00
sctp_peeloff.c	Fix the switching on/off of CMT using sysctl and socket option.	2010-08-28 17:59:51 +00:00
sctp_peeloff.h
sctp_structs.h	Fix a bug where also the number of non-renegable gap reports	2010-12-04 19:29:49 +00:00
sctp_sysctl.c	Specify a CTLTYPE_FOO so that a future sysctl(8) change does not need	2011-01-18 21:14:13 +00:00
sctp_sysctl.h	Provide a possibility to configure the inital congestion window to the	2010-12-22 19:04:14 +00:00
sctp_timer.c	Define and use SCTP_SSN_GE, SCTP_SSN_GT, SCTP_TSN_GE, SCTP_TSN_GT macros	2010-12-30 21:32:35 +00:00
sctp_timer.h	Remove two functions which are not used.	2010-11-07 17:50:56 +00:00
sctp_uio.h	Fix it so we align with new socket API draft for	2011-01-20 12:40:09 +00:00
sctp_usrreq.c	Improve comments.	2011-01-20 13:53:34 +00:00
sctp_var.h
sctp.h	Add an SCTP socket option to retrieve the number of timeouts	2010-11-16 22:16:38 +00:00
sctputil.c	Cleanup the management of CC functions.	2011-01-19 22:10:35 +00:00
sctputil.h	Do not have the MTU table twice in the code. Therefore move the	2010-11-07 18:50:35 +00:00
siftr.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
tcp_debug.c
tcp_debug.h
tcp_fsm.h
tcp_hostcache.c	sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly.	2011-01-12 19:53:50 +00:00
tcp_hostcache.h
tcp_input.c	Reset the last_sack_ack SACK hint for TCP input processing to ensure that the	2011-01-10 06:12:01 +00:00
tcp_lro.c	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
tcp_lro.h	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
tcp_offload.c
tcp_offload.h
tcp_output.c	- Add some helper hook points to the TCP stack. The hooks allow Khelp modules to	2010-12-28 12:13:30 +00:00
tcp_reass.c	Specify a CTLTYPE_FOO so that a future sysctl(8) change does not need	2011-01-18 21:14:13 +00:00
tcp_sack.c	Add a new sack hint to track the most recent and highest sacked sequence number.	2010-12-28 03:27:20 +00:00
tcp_seq.h
tcp_subr.c	Specify a CTLTYPE_FOO so that a future sysctl(8) change does not need	2011-01-18 21:14:13 +00:00
tcp_syncache.c	sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly.	2011-01-12 19:53:50 +00:00
tcp_syncache.h	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
tcp_timer.c	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
tcp_timer.h	Remove the TCP inflight bandwidth limiter as announced in r211315	2010-09-16 21:06:45 +00:00
tcp_timewait.c	After some off-list discussion, revert a number of changes to the	2010-11-22 19:32:54 +00:00
tcp_usrreq.c	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
tcp_var.h	Fixe some whitespace nits that were introduced in r216758.	2011-01-11 01:32:08 +00:00
tcp.h	Add new, per connection, statistics for TCP, including:	2010-11-17 18:55:12 +00:00
tcpip.h
toedev.h
udp_usrreq.c	Fix style 9 nit that snuck in when I	2011-01-19 20:57:08 +00:00
udp_var.h	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00
udp.h	Trim extra spaces before tabs.	2011-01-07 21:40:34 +00:00