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https://issues.apache.org/jira/browse/PROTON-1523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433709#comment-16433709
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ASF subversion and git services commented on PROTON-1523:
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Commit d58bd7154558a3be3a68dfee71f08c7d76bad958 in qpid-proton's branch
refs/heads/master from [~gemmellr]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=d58bd71 ]
PROTON-636, PROTON-1809, PROTON-1523: update session capacity api doc to
clarify its behaviour
> [proton c] API unclear how incoming_capacity and max_frame work
> ---------------------------------------------------------------
>
> Key: PROTON-1523
> URL: https://issues.apache.org/jira/browse/PROTON-1523
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-c
> Affects Versions: proton-c-0.17.0
> Reporter: Chuck Rolke
> Priority: Major
>
> Two settings are available to throttle incoming traffic. These operate in
> units of bytes:
> * pn_transport_set_max_frame
> * pn_session_set_incoming_capacity
> Suppose a user sets a max_frame to 1 Mbyte and incoming_capacity to 2 Mbytes.
> How many 200-byte hello-world messages might a user expect to be able to
> receive before the local incoming-window closes? 10,000? The answer turns out
> to be 2.
> The logical disconnect is that the user interface incoming_capacity operates
> in bytes but the AMQP protocol over the wire operates with an Incoming-Window
> in frames. In the user's case the API assumes full frames and sets
> Incoming-Window = (incoming_capacity / max_frame), or 2. When the sending
> peer sends 200-byte messages the actual incoming capacity is 400 bytes and
> not 2Mbytes.
> The rules (AFAICT) are:
> {noformat}
> IF (max_size is specified)
> incoming_window = incoming_capacity / max_size
> ELSE
> incoming_window = 2147473647
> ENDIF
> {noformat}
> Noting:
> * Incoming capacity is achieved only if the peer sends max_size frames.
> * If max_frame is not set then the incoming_capacity setting is ignored.
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