Re: [quicwg/base-drafts] Ack Delay and TLP (#1796)

ianswett <> Mon, 01 October 2018 19:21 UTC

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Subject: Re: [quicwg/base-drafts] Ack Delay and TLP (#1796)
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I realize kMaxDatagramSize is in the constants section, but I'm not sure it should be a constant throughout a connection, given the existence of PMTU, so it's inclusion there may be incorrect or at least misleading.

I was thinking of tracking the number of in flight packets that are >= 1200 bytes on the sender side in addition to the number of bytes in flight and then on the receiver side, only send an ack immediately if two packets >1200 bytes are received.  That would keep the concept of full-sized packets while also allow changing the MTU during a connection without any other issues.

As I mention it, I realize this has the unintended side effect that if the sender wants to delay acks, it can send a 1199 byte packet instead of 1200 byte one.  I'm not sure if that's a feature or a bug.

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