Poor ZC performance?

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Hello.

I'm doing corosync 2.0.0 cpgbench and cpgbenchzc tests on a single node. What do I see:
cpgbench
624586 messages received 8000 bytes per write 10.000 Seconds runtime 62458.638 TP/s 499.669 MB/s.
cpgbenchzc
434134 messages received 8000 bytes per write 10.000 Seconds runtime 43413.357 TP/s 347.307 MB/s.

Zero-copy code gives worse performance than non-zc one. How could it be?

Thanks.

- VV
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