Re: [quicwg/base-drafts] QPACK SC: No encoder memory for blocked (#4008)

[Dmitri Tikhonov <[e-mail]>]

> An encoder allocates memory to track all dynamic table references in unacknowledged representations.  Implementations can directly limit the amount of state memory by only using as many references to the dynamic table as it wishes to track; no signaling to the decoder is required.

This is true, but this is also obvious, at least once you start implementing the encoder.  Too, there is the natural limit on dynamic references: it is the function of the product of the number of allowed streams and the number of entries in the dynamic table (which itself is a function of the table size).

I am concerned that this new verbiage puts the wrong thought into the head of the implementer; we should not encourage this.  Limiting the number of dynamic table references (done out of memory conservation zeal) affects compression performance directly -- it worsens it.

Perhaps we can tack on the following sentence to the end of the paragraph:

> Note that limiting the number of references is likely to affect performance negatively.

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