pnowojski commented on issue #11088: [FLINK-16012][runtime] Reduce the default number of buffers per channel from 2 to 1 URL: https://github.com/apache/flink/pull/11088#issuecomment-604973804 Thanks for the update @wsry, good that we at least confirmed what is the issue here. And good job on [figuring this out](https://github.com/apache/flink/pull/11088#issuecomment-593072136). Let's maybe try to gather the data for the 0 exclusive buffers first. Since 1 exclusive buffer can cause some performance regressions in some rare cases, we might prefer in the end to just advertise two main different setups: full throughput with 2 exclusive buffers and low throughput with 1/0 exclusive buffers. Anything in between would be for power users to self tune?
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