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Re: [quicwg/base-drafts] Incorrect values for Required Insert Count (#3305)

Dmitri Tikhonov <notifications@github.com> Tue, 17 December 2019 13:14 UTC

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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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