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Thomas Graf a76c0adf60 sctp: Do not account for sizeof(struct sk_buff) in estimated rwnd ... When checking whether a DATA chunk fits into the estimated rwnd a full sizeof(struct sk_buff) is added to the needed chunk size. This quickly exhausts the available rwnd space and leads to packets being sent which are much below the PMTU limit. This can lead to much worse performance. The reason for this behaviour was to avoid putting too much memory pressure on the receiver. The concept is not completely irational because a Linux receiver does in fact clone an skb for each DATA chunk delivered. However, Linux also reserves half the available socket buffer space for data structures therefore usage of it is already accounted for. When proposing to change this the last time it was noted that this behaviour was introduced to solve a performance issue caused by rwnd overusage in combination with small DATA chunks. Trying to reproduce this I found that with the sk_buff overhead removed, the performance would improve significantly unless socket buffer limits are increased. The following numbers have been gathered using a patched iperf supporting SCTP over a live 1 Gbit ethernet network. The -l option was used to limit DATA chunk sizes. The numbers listed are based on the average of 3 test runs each. Default values have been used for sk_(r|w)mem. Chunk Size Unpatched No Overhead ------------------------------------- 4 15.2 Kbit [!] 12.2 Mbit [!] 8 35.8 Kbit [!] 26.0 Mbit [!] 16 95.5 Kbit [!] 54.4 Mbit [!] 32 106.7 Mbit 102.3 Mbit 64 189.2 Mbit 188.3 Mbit 128 331.2 Mbit 334.8 Mbit 256 537.7 Mbit 536.0 Mbit 512 766.9 Mbit 766.6 Mbit 1024 810.1 Mbit 808.6 Mbit Signed-off-by: Thomas Graf <tgraf@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		13 years ago
..
Kconfig	…
Makefile	…
associola.c	sctp: fix incorrect overflow check on autoclose	13 years ago
auth.c	sctp: better integer overflow check in sctp_auth_create_key()	13 years ago
bind_addr.c	…
chunk.c	…
command.c	…
debug.c	…
endpointola.c	…
input.c	…
inqueue.c	…
ipv6.c	ipv6: tcp: fix TCLASS value in ACK messages sent from TIME_WAIT	13 years ago
objcnt.c	…
output.c	sctp: Do not account for sizeof(struct sk_buff) in estimated rwnd	13 years ago
outqueue.c	sctp: Do not account for sizeof(struct sk_buff) in estimated rwnd	13 years ago
primitive.c	…
probe.c	…
proc.c	net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules	13 years ago
protocol.c	sctp: fix incorrect overflow check on autoclose	13 years ago
sm_make_chunk.c	sctp: Bundle HEAERTBEAT into ASCONF_ACK	14 years ago
sm_sideeffect.c	sctp: deal with multiple COOKIE_ECHO chunks	14 years ago
sm_statefuns.c	Merge branch 'master' of github.com:davem330/net	14 years ago
sm_statetable.c	sctp: Enforce retransmission limit during shutdown	14 years ago
socket.c	sctp: fix incorrect overflow check on autoclose	13 years ago
ssnmap.c	…
sysctl.c	sctp: fix incorrect overflow check on autoclose	13 years ago
transport.c	…
tsnmap.c	…
ulpevent.c	sctp: ABORT if receive, reassmbly, or reodering queue is not empty while closing socket	14 years ago
ulpqueue.c	…