linux/net/rxrpc
David Howells 2c13c05c5f rxrpc: Adjust retransmission backoff
Improve retransmission backoff by only backing off when we retransmit data
packets rather than when we set the lost ack timer.

To this end:

 (1) In rxrpc_resend(), use rxrpc_get_rto_backoff() when setting the
     retransmission timer and only tell it that we are retransmitting if we
     actually have things to retransmit.

     Note that it's possible for the retransmission algorithm to race with
     the processing of a received ACK, so we may see no packets needing
     retransmission.

 (2) In rxrpc_send_data_packet(), don't bump the backoff when setting the
     ack_lost_at timer, as it may then get bumped twice.

With this, when looking at one particular packet, the retransmission
intervals were seen to be 1.5ms, 2ms, 3ms, 5ms, 9ms, 17ms, 33ms, 71ms,
136ms, 264ms, 544ms, 1.088s, 2.1s, 4.2s and 8.3s.

Fixes: c410bf0193 ("rxrpc: Fix the excessive initial retransmission timeout")
Suggested-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/164138117069.2023386.17446904856843997127.stgit@warthog.procyon.org.uk/
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-01-22 02:03:24 +00:00
..
af_rxrpc.c rxrpc: Fix fall-through warnings for Clang 2021-06-04 17:40:04 -05:00
ar-internal.h rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
call_accept.c rxrpc: Fix memory leak in rxrpc_lookup_local 2021-01-28 13:12:14 -08:00
call_event.c rxrpc: Adjust retransmission backoff 2022-01-22 02:03:24 +00:00
call_object.c rxrpc: Fix clearance of Tx/Rx ring when releasing a call 2021-02-04 18:11:08 -08:00
conn_client.c rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle() 2021-11-29 15:39:40 +00:00
conn_event.c rxrpc: Merge prime_packet_security into init_connection_security 2020-11-23 18:09:30 +00:00
conn_object.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
conn_service.c rxrpc: Don't retain the server key in the connection 2020-11-23 18:09:29 +00:00
input.c rxrpc: Call state should be read with READ_ONCE() under some circumstances 2021-01-13 10:38:20 -08:00
insecure.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
Kconfig net: RxRPC: make dependent Kconfig symbols be shown indented 2021-08-18 10:12:11 +01:00
key.c rxrpc: Fix handling of an unsupported token type in rxrpc_read() 2021-01-13 10:38:00 -08:00
local_event.c rxrpc: Fix a typo 2021-06-02 14:01:55 -07:00
local_object.c rxrpc: Fix dependency on IPv6 in udp tunnel config 2021-02-12 16:42:05 -08:00
Makefile rxrpc: Split the server key type (rxrpc_s) into its own file 2020-11-23 18:09:29 +00:00
misc.c rxrpc: Fix the excessive initial retransmission timeout 2020-05-11 16:42:28 +01:00
net_ns.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
output.c rxrpc: Adjust retransmission backoff 2022-01-22 02:03:24 +00:00
peer_event.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
peer_object.c rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-11-29 15:40:02 +00:00
proc.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
protocol.h rxrpc: Improve jumbo packet counting 2019-08-27 09:48:37 +01:00
recvmsg.c afs: Don't truncate iter during data fetch 2021-04-23 10:17:26 +01:00
rtt.c rxrpc: Fix _usecs_to_jiffies() by using usecs_to_jiffies() 2021-09-24 14:18:34 +01:00
rxkad.c rxrpc: rxkad: Remove redundant variable offset 2021-04-27 14:05:06 -07:00
security.c rxrpc: Hand server key parsing off to the security class 2020-11-23 18:09:29 +00:00
sendmsg.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
server_key.c rxrpc: Allow security classes to give more info on server keys 2020-11-23 18:09:29 +00:00
skbuff.c rxrpc: Use skb_unshare() rather than skb_cow_data() 2019-08-27 10:13:46 +01:00
sysctl.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
utils.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00