Limited IOP/s on Dual Xeon KVM Host

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Hello lists,

on a dual Xeon KVM Host i get max 6000 IOP/s random 4k writes AND reads. On a Single Xeon KVM Host i get 17.000-18.000 IOP/s write and read. I already tried to pin the kvm process using numactl and also the fio process but it doesn't help on the dual xeon.

10GBE Network is fine. I get 9.8Gbit/s on both hosts. Kernel is also he same on both.

Anybody an idea?

Greets
Stefan
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