Date: Tue, 17 Dec 2019 05:14:29 -0800
From: Dmitri Tikhonov <notifications@github.com>
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Message-ID: <quicwg/base-drafts/issues/3305/566536163@github.com>
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Subject: Re: [quicwg/base-drafts] Incorrect values for Required Insert Count
 (#3305)
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>  This is a performance problem up until the point where the encoder hasn't provided the "required" entries and **finds no reason to do so**, at which point the performance bug could be come a deadlock. [Emphasis added.]

The "finds no reason to do so" is a functional, not performance, bug in the encoder.

As for performance, that's why there is the `QPACK_BLOCKED_STREAMS` setting.

> I think that it would be better for the protocol if a decoder were able to generate an error if the maximum index referred to in a header block did not exactly match the Required Insert Count.

I thought there was verbiage to that effect already, but I don't see it in the [current draft](https://tools.ietf.org/html/draft-ietf-quic-qpack-11).

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<blockquote>
<p>This is a performance problem up until the point where the encoder hasn't provided the "required" entries and <strong>finds no reason to do so</strong>, at which point the performance bug could be come a deadlock. [Emphasis added.]</p>
</blockquote>
<p>The "finds no reason to do so" is a functional, not performance, bug in the encoder.</p>
<p>As for performance, that's why there is the <code>QPACK_BLOCKED_STREAMS</code> setting.</p>
<blockquote>
<p>I think that it would be better for the protocol if a decoder were able to generate an error if the maximum index referred to in a header block did not exactly match the Required Insert Count.</p>
</blockquote>
<p>I thought there was verbiage to that effect already, but I don't see it in the <a href="https://tools.ietf.org/html/draft-ietf-quic-qpack-11" rel="nofollow">current draft</a>.</p>

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