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26 lines
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.. _vhost05:
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Limitations
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-----------
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There are some limitations when using the qemu vhost driver. Some are described in this section.
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Performance
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^^^^^^^^^^^
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VPP performance with vHost is limited by the Qemu vHost driver. FD.io VPP 18.04 CSIT vHost testing
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shows with 2 threads, 2 cores and a Queue size of 1024 the maximum NDR throughput was about 7.5 Mpps.
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This is about the limit at this time.
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For all the details on the CSIT VM vhost connection refer to the
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`CSIT VM vHost performance tests <https://docs.fd.io/csit/rls1804/report/vpp_performance_tests/packet_throughput_graphs/vm_vhost.html>`_.
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Features
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^^^^^^^^
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These are the features not supported with FD.io VPP vHost.
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* VPP implements vHost in device mode only. VPP is intended to work with Qemu which implements vHost in driver mode, it does not implement vHost driver mode.
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* VPP vHost implementation does not support checksum or transmit segmentation offload.
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* VPP vHost implementation does not support packet receive filtering feature for controlling receive traffic.
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