Re: [quicwg/base-drafts] PTO probes are sent too frequently (#3546)

Martin Thomson <> Mon, 30 March 2020 02:51 UTC

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Date: Sun, 29 Mar 2020 19:51:32 -0700
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] PTO probes are sent too frequently (#3546)
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So the operating principle here is that we are expecting progress to Handshake to be made, which means that we need to align with our existing logic that enables PTO in that case.

For reference, the check we use to enable PTO during the anti-amplification phase is the inverse of the following:

  if (no ack-eliciting packets in flight &&
      peer not awaiting address validation):

Which follows the "server at anti-amplification limit" check.  So maybe `(client && no ack-eliciting packets in flight && peer not awaiting address validation)` is the check you want rather than `is initial`.

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