[PATCH net-next 0/8] rxrpc: Implement slow-start and other bits

From: David Howells
Date: Sat Sep 24 2016 - 19:25:05 EST

This set of patches implements the RxRPC slow-start feature for AF_RXRPC to
improve performance and handling of occasional packet loss. This is more or
less the same as TCP slow start [RFC 5681]. Firstly, there are some ACK
generation improvements:

(1) Send ACKs regularly to apprise the peer of our state so that they can do
congestion management of their own.

(2) Send an ACK when we fill in a hole in the buffer so that the peer can
find out that we did this thus forestalling retransmission.

(3) Note the final DATA packet's serial number in the final ACK for
correlation purposes.

and a couple of bug fixes:

(4) Reinitialise the ACK state and clear the ACK and resend timers upon
entering the client reply reception phase to kill off any pending probe

(5) Delay the resend timer to allow for nsec->jiffies conversion errors.

and then there's the slow-start pieces:

(6) Summarise an ACK.

(7) Schedule a PING or IDLE ACK if the reply to a client call is overdue to
try and find out what happened to it.

(8) Implement the slow start feature.

The patches can be found here also:


Tagged thusly:


David Howells (8):
rxrpc: Send an ACK after every few DATA packets we receive
rxrpc: Send an immediate ACK if we fill in a hole
rxrpc: Include the last reply DATA serial number in the final ACK
rxrpc: Reinitialise the call ACK and timer state for client reply phase
rxrpc: Delay the resend timer to allow for nsec->jiffies conv error
rxrpc: Generate a summary of the ACK state for later use
rxrpc: Schedule an ACK if the reply to a client call appears overdue
rxrpc: Implement slow-start

include/trace/events/rxrpc.h | 45 ++++++++
net/rxrpc/ar-internal.h | 71 ++++++++++++
net/rxrpc/call_event.c | 47 +++++++-
net/rxrpc/call_object.c | 13 ++
net/rxrpc/conn_event.c | 1
net/rxrpc/input.c | 241 +++++++++++++++++++++++++++++++++++++++---
net/rxrpc/misc.c | 23 ++++
net/rxrpc/output.c | 34 ++++--
net/rxrpc/recvmsg.c | 19 +++
net/rxrpc/sendmsg.c | 7 +
10 files changed, 463 insertions(+), 38 deletions(-)