Subject: Re: [quicwg/base-drafts] ACK of ACK are useful (#2546)

From: Jana Iyengar <[email-masked]>
Date: Wed, 03 Apr 2019 19:47:39 +0000 (UTC)

Agreed with @ianswett. Irrespective of what we recommend here, note that a sender of ACKs cannot assume what the peer will do -- when the peer will send an ACK for ACKs, I mean -- so, it will end up having to send a periodic PING anyways. Piggybacking a PING periodically (once an RTT, for example) is useful for RTT measurement as well, since ACK of ACKs do not get used for RTT (see #2568 for more discussion on this point).

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