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rsync with multi-core server should go faster than it goes. Am I wrong?

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I'm launching a rsync simple command between two servers. Both servers have two eth interfaces on bonding. When I send a big file from one server to the other with rsync I reach 130M/s transfer rate.

But, and here is the problem, when I send a directory with lots of small files the transfer is 1M/s at its best.

I've checked both cpu loads(8cpu i7), and they are at 10% maximum.

Knowing that what makes all the transfer slow down is the open/close of the files, and this 'theoretically' goes on the cpu, I understand that this can be easily tuned. But I do not know how to tune that.

Any tip on how to make rsync use all CPUs?


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