> "Jun Wang" <junwan...@cestc.cn> writes: >>> Hello Jun, >>> >>> Are the 20G, 17G, and 11G figures a speed? Or the volume of data sent? >>> How are you measuring this? >>> >>> DPDK can be very sensitive to which numa node, or even core a PMD is >>> running on. But I don't know what is causing this issue specifically. >>> >>> Cheers, >>> M >> >> Hi Mike, >> >> I did a detailed comparison and found that the issue is actually with the >> performance >> >> of mirror-to itself, not with virtio-user. Even when using mirror-to >> directly, >> >> there is still a significant performance degradation. > > You mean there is some issue with the mirror-to option? Or do you mean > that you are not expecting a slowdown when using port mirroring at all?
Yes, the performance of mirror-to itself drops significantly―I have already verified this. The original intention of using the DPDK virtio-user interface for packet capture was to ensure that ovs-tcpdump in a DPDK environment does not cause a major performance drop. However, at the moment, it seems that combining mirror-to with the virtio-user interface does not provide any improvement. >> ovs-tcpdump -i vh-userclient-08a1f95c-3b --mirror-to tap1 -w a.pcap >> ovs-tcpdump -i vh-userclient-08a1f95c-3b -w b.pcap >> Jun Wang
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