Date: Thu, 08 Feb 2018 04:01:39 +0000 (UTC)
From: Yang Chi <notifications@github.com>
Reply-To: quicwg/base-drafts
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To: quicwg/base-drafts <base-drafts@noreply.github.com>
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Message-ID: <quicwg/base-drafts/issues/1102@github.com>
Subject: [quicwg/base-drafts] wrong MSS value in congestion avoidance phase
 (#1102)
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Current Recovery specs uses kDefaultMss as MSS value during congestion avoidance in OnPacketAckedCC function. As a result, if a sender sends out a congestion_window amount of data, and all these data gets acked in one onPacketAckedCC call, congestion_window will increase by kDefaultMss. But the sender's real MSS might be different. Seems like we should have another mss value defined in the specs as min(peer's advertised max_packet_size, pmtu), and use that in the OnPacketAckedCC function.

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<p>Current Recovery specs uses kDefaultMss as MSS value during congestion avoidance in OnPacketAckedCC function. As a result, if a sender sends out a congestion_window amount of data, and all these data gets acked in one onPacketAckedCC call, congestion_window will increase by kDefaultMss. But the sender's real MSS might be different. Seems like we should have another mss value defined in the specs as min(peer's advertised max_packet_size, pmtu), and use that in the OnPacketAckedCC function.</p>

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