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[lwip-devel] [bug #51138] RTT measurement after retransmission
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From: |
Ambroz Bizjak |
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Subject: |
[lwip-devel] [bug #51138] RTT measurement after retransmission |
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Date: |
Mon, 29 May 2017 13:51:17 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36 |
Follow-up Comment #1, bug #51138 (project lwip):
... actually I see that even my proposed solution (invalidate any RTT
measurement on any retransmission) does not always prevent RTT
over-estimation. Especially with fast retransmission. If a new segment is sent
for the first time before the retransmitted segment is acknowledged, an RTT
measurement would be started which could be over-estimated due to ACK being
delayed due to the lost segment.
To prevent that we would need to inhibit starting any RTT measurement until
all retransmitted segments are acked, right?
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