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linux/net/ipv6
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Eric Dumazet a34a101e1e ipv6: disable GSO on sockets hitting dst_allfrag 
If the allfrag feature has been set on a host route (due to an ICMPv6
Packet Too Big received indicating a MTU of less than 1280), we hit a
very slow behavior in TCP stack, because all big packets are dropped and
only a retransmit timer is able to push one MSS frame every 200 ms.

One way to handle this is to disable GSO on the socket the first time a
super packet is dropped. Adding a specific dst_allfrag() in the fast
path is probably overkill since the dst_allfrag() case almost never
happen.

Result on netperf TCP_STREAM, one flow :

Before : 60 kbit/sec
After : 1.6 Gbit/sec

Reported-by: Tore Anderson <tore@fud.no>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Tore Anderson <tore@fud.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-19 04:02:12 -04:00
..
netfilter net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
addrconf.c Merge branch 'delete-tokenring' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2012-05-16 01:02:40 -04:00
addrconf_core.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
addrlabel.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
af_inet6.c ipv6: bool conversions phase1 2012-05-18 02:24:13 -04:00
ah6.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
anycast.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
datagram.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
esp6.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
exthdrs.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
exthdrs_core.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
fib6_rules.c net/ipv6/fib6_rules.c: Checkpatch cleanup 2012-04-02 04:33:46 -04:00
icmp.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -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 net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
ip6_flowlabel.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
ip6_input.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
ip6_output.c ipv6: disable GSO on sockets hitting dst_allfrag 2012-05-19 04:02:12 -04:00
ip6_tunnel.c ipv6: bool conversions phase1 2012-05-18 02:24:13 -04:00
ip6mr.c net: ipv6: Standardize prefixes for message logging 2012-05-16 01:01:03 -04:00
ipcomp6.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
ipv6_sockglue.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
Kconfig xfrm: make xfrm_algo.c a module 2012-05-15 13:13:34 -04:00
Makefile
mcast.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
mip6.c ipv6: correct the ipv6 option name - Pad0 to Pad1 2012-05-17 15:49:51 -04:00
ndisc.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -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
raw.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
reassembly.c ip_frag: struct inet_frags match() method returns a bool 2012-05-18 01:40:27 -04:00
route.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
sit.c net: ipv6: Standardize prefixes for message logging 2012-05-16 01:01:03 -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: bool conversions 2012-05-17 14:59:59 -04:00
tunnel6.c net: ipv6: Standardize prefixes for message logging 2012-05-16 01:01:03 -04:00
udp.c net/ipv6/udp: UDP encapsulation: introduce encap_rcv hook into IPv6 2012-04-28 22:21:51 -04:00
udp_impl.h
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
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c
xfrm6_mode_transport.c
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