[tor-dev] Proposal 213: Remove stream-level sendmes from the design

[Roger Dingledine]

On Mon, Nov 05, 2012 at 06:57:48AM +0100, Andreas Krey wrote:
>  With no per-stream window a single stalled stream would
> block the circuit forever.

Wait, what?

Can you define 'stalled' here? I think you are misunderstanding the
current (and proposed) design.

With no per-stream window, the circuit will round-robin between the
streams that want to send a cell, just as it does now. The only difference
in the proposed change is that it would stop ignoring streams who have
sent their whole stream window but not yet heard a stream-level sendme
back. In either case it would continue obeying the circuit sendme windows.

> When a stream announces window to the other side I expect it
> to be capable to accept that data somewhere, so even if the
> stream windows currently overbook the circuit window that
> data should drain into the local buffers and let the circuit
> window reopen.

It does.

--Roger