GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

rxrpc: Express protocol timeouts in terms of RTT

Browse source 
Express protocol timeouts for data retransmission and deferred ack
generation in terms on RTT rather than specified timeouts once we have
sufficient RTT samples.

For the moment, this requires just one RTT sample to be able to use this
for ack deferral and two for data retransmission.

The data retransmission timeout is set at RTT*1.5 and the ACK deferral
timeout is set at RTT.

Note that the calculated timeout is limited to a minimum of 4ns to make
sure it doesn't happen too quickly.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-11-24 10:18:41 +00:00
parent 8637abaa72
commit beb8e5e4f3
2 changed files with 25 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
net/rxrpc/sendmsg.c
View file

@ -226,6 +226,13 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
} else {
unsigned long now = jiffies, resend_at;
if (call->peer->rtt_usage > 1)
resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
else
resend_at = rxrpc_resend_timeout;
if (resend_at < 1)
resend_at = 1;
resend_at = now + rxrpc_resend_timeout;
WRITE_ONCE(call->resend_at, resend_at);
rxrpc_reduce_call_timer(call, resend_at, now,