Agreed Eric, the buffer size should be increased so that we can accommodate a MTU-sized packet + mergeable virtio net header in a single buffer. I will send a patch to fix shortly cleaning up the #define headers as Rusty indicated and increasing the buffer size slightly by VirtioNet header size bytes per Eric.
Jason, I'll followup with you directly - I'd like to know your exact workload (single steam or multi-stream netperf?), VM configuration, etc, and also see if the nit that Erichas pointed out affects your results. It is also worth noting that we may want to tune the queue sizes for your benchmarks, e.g, by reducing buffer size from 4KB to MTU-sized but keeping queue length constant, we're implicitly decreasing the number of bytes stored in the VirtioQueue for the VirtioNet device, so increasing the queue size may help. Best, Mike _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
