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Ken Giusti commented on DISPATCH-1352: -------------------------------------- {quote}About the code impact; that's a whole different story: we need to recognize the "embedded" qd_buffer_t while freeing qd_buffer_list_t to avoid deallocating them. {quote} That's where the "beauty" of the extra refcount come in - right now the qd_message_send/qd_message_receive code will recognize that and avoid the free. Poke around the "add fanout" logic and let me know if you have any Q's > 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 > Components: Routing Engine > Affects Versions: 1.7.0 > Reporter: Francesco Nigro > Priority: Major > Attachments: screenshot-1.png, screenshot-2.png > > > 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, by solving it will bring a huge performance improvement to > make the router able to scale better. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org