franz1981 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-535786097 @wy96f thanks to have tried! It sounds strange to me: I was thinking the reason why was taking more was due to being continuosly stopped/being awaken and sending short chunks to the network (ie more syscalls with less data). I have a strong feeling that sendFile send a 1 MB chunk *directly* without using the TCP buffer at all....if is the case, it means we should increase the chunkSize (1 MB or at least 100K) and the TCP buffer accordingly (that's very small, by default afaik). Did you observe that the network was saturated in both cases? If you use async-profiler you can check what the kernel does and where most the cost is for both cases....
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