[jira] [Created] (DISPATCH-1352) qd_buffer_list_clone cost is dominated by cache misses

["Francesco Nigro (JIRA)" <ji...@apache.org>]

Francesco Nigro created DISPATCH-1352:
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             Summary: qd_buffer_list_clone cost is dominated by cache misses
                 Key: DISPATCH-1352
                 URL: https://issues.apache.org/jira/browse/DISPATCH-1352
             Project: Qpid Dispatch
          Issue Type: Improvement
    Affects Versions: 1.7.0
            Reporter: Francesco Nigro


qd_buffer_list_clone on qd_message_copy for qd_message_pvt_t.ma_to_override/ma_trace/ma_ingress is dominated by cache misses costs:
* to "allocate" new qd_buffer_t
* to reference any qd_buffer_t from the source qd_buffer_list_t

Such cost is the main reason why the core thread is having a very low IPC (< 1 istr/cycle) and given the single threaded nature of the router while dealing with it; solving it will bring a huge performance improvement to make the router able to scale better.



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