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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DISPATCH-888) Balanced distribution algorithm visits each link to determine the best_eligible_link
Date Tue, 05 Dec 2017 14:36:04 GMT

     [ https://issues.apache.org/jira/browse/DISPATCH-888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Ross resolved DISPATCH-888.
-------------------------------
    Resolution: Fixed

> Balanced distribution algorithm visits each link to determine the best_eligible_link
> ------------------------------------------------------------------------------------
>
>                 Key: DISPATCH-888
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-888
>             Project: Qpid Dispatch
>          Issue Type: Improvement
>          Components: Container
>    Affects Versions: 1.0.0
>            Reporter: Ganesh Murthy
>            Assignee: Ganesh Murthy
>            Priority: Minor
>             Fix For: 1.1.0
>
>
> 1. In forwarder.c (qdr_forward_balanced_CT()) the loop that selects the best_eligible_link
loops thru all rlinks as seen below
> {noformat}
>     while (link_ref) {
>         qdr_link_t *link     = link_ref->link;
>         uint32_t    value    = DEQ_SIZE(link->undelivered) + DEQ_SIZE(link->unsettled);
>         bool        eligible = link->capacity > value;
>         //
>         // If this is the best eligible link so far, record the fact.
>         // Otherwise, if this is the best ineligible link, make note of that.
>         //
>         if (eligible && eligible_link_value > value) {
>             best_eligible_link  = link;
>             eligible_link_value = value;
>         } else if (!eligible && ineligible_link_value > value) {
>             best_ineligible_link  = link;
>             ineligible_link_value = value;
>         }
>         link_ref = DEQ_NEXT(link_ref);
>     }
> {noformat}
> Instead the code can exit the loop if the value is 0 (zero). When there are no outstanding
deliveries on a link we can without doubt choose that link as the best one to send the delivery.

> 2. Rotate the rlinks list only if value is zero to avoid frequent list rotation. In the
synchronous case, the code still works.



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