[jira] [Created] (PROTON-2229) pn_data_t initialization lead to low performance

["wanfa deng (Jira)" <ji...@apache.org>]

wanfa deng created PROTON-2229:
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             Summary: pn_data_t initialization lead to low performance
                 Key: PROTON-2229
                 URL: https://issues.apache.org/jira/browse/PROTON-2229
             Project: Qpid Proton
          Issue Type: Bug
          Components: proton-c
    Affects Versions: proton-c-0.30.0
         Environment: x86_64 GNU/Linux
            Reporter: wanfa deng


Recently I update qpid-proton from 0.28.0 to 0.30.0 version, and find massive produce performance fallen by 80%。

Finally，I find this is caused by pn_data_t initialization。 In 0.28.0 version, it's like 
data->buf = pn_buffer(64);
and in In 0.30.0 version, it's like 
data->buf = NULL;
 
And when data->buf is initialized by NULL,  in the following call flow, 
pn_data_put_binary->pni_data_intern_node->pn_buffer_memory->pn_buffer_defrag->pn_buffer_rotate, 
buf->start is more likely not equal to 0, this is leading to buffer rotate, and make the performance lower.



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