wy96f edited a comment on issue #2845: ARTEMIS-2336 Use zero copy to replicate journal/page/large message file (AGAIN) URL: https://github.com/apache/activemq-artemis/pull/2845#issuecomment-547231728 I was dubious about it too, but after some analysis, I somewhat understood it. In fact size estimator is limiting non file packets in file region=true. The log showed flow control triggered every ~450 times send. This make senses as each non file packet occupies ~300 bytes, and total size of them just over highWaterMark(default 128k). And flow control waited for ~4 seconds to allow 450 non file and 450 file packet to be drained(~450*1MB chunk size=~450MB data transferred in ~4 seconds, i.e. ~100MB/s). I uploaded a file containing a small section of artemis.log, see https://filebin.net/emt7r3h7yg30zq8e/artemis_section.log?t=r9f67qpl
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