netdev - [net-next 2/2] tipc: reduce sensitive to retransmit failures

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Date:   Wed,  6 Nov 2019 13:26:10 +0700
From:   Hoang Le <hoang.h.le@...tech.com.au>
To:     jon.maloy@...csson.com, maloy@...jonn.com, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net
Subject: [net-next 2/2] tipc: reduce sensitive to retransmit failures

With huge cluster (e.g >200nodes), the amount of that flow:
gap -> retransmit packet -> acked will take time in case of STATE_MSG
dropped/delayed because a lot of traffic. This lead to 1.5 sec tolerance
value criteria made link easy failure around 2nd, 3rd of failed
retransmission attempts.

Instead of re-introduced criteria of 99 faled retransmissions to fix the
issue, we increase failure detection timer to ten times tolerance value.

Fixes: 77cf8edbc0e7 ("tipc: simplify stale link failure criteria")
Acked-by: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: Hoang Le <hoang.h.le@...tech.com.au>
---
 net/tipc/link.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 038861bad72b..2aed7a958a8c 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1087,7 +1087,7 @@ static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
 		return false;

 	if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
-			msecs_to_jiffies(r->tolerance)))
+			msecs_to_jiffies(r->tolerance * 10)))
 		return false;

 	hdr = buf_msg(skb);
-- 
2.20.1