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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