Rados bench decreasing performance for large data

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Hi
I've began experimenting with rados bench and I've noticed bizarre
behavior for jerasure and lrc plugins. I'm writing very large amounts
of data: ~2000 objects of size 64MB.
When reading the data with 9 parallel client, I'm noticing a linear
increase in latency around the middle of the read experiment (latency
was steady up to that point).
Is that an expected behavior?
How can it be explained?

Thanks,
Oleg
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