>I don't really see anything suspicious in the profile. This looks more >like a kernel scheduler issue than a postgres bottleneck one. It seems >that somehow using nonblocking IO (started in 9.5) causes scheduling >issues when pgbouncer is also local. > >Could you do perf stat -ddd -a sleep 10 or something during both runs? I >suspect that the context switch ratios will be quite different.
Perf show that in 9.5 case context switches occurs about 2 times less. Perf output is attached. Regards, Dmitriy Sarafannikov
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