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SR-IOV VF performance and default bandwidth rate limiting

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Hi All,

 

Is there a default rate limit for VFs created for 82599?

 

On our servers we create up to 32 VFs per NIC and assign to VMs (PCI passthrough). Servers run Ubuntu with KV limitM.

We found out that usage of VF on Boot OS level gives up to 2-3Gbps throughput. Same between VFs.

 

Measured using iperf running with single or multiple parallel threads.

 

In another our environment we have X540 cards and same problem exists there as well.

 

Thanks,

-Vladimir


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