On Mon, Apr 01, 2019 at 06:32:40PM +0200, Stefano Garzarella wrote: > Hi Alex, > I'm sending you some benchmarks and information about VSOCK CCing qemu-devel > and linux-netdev (maybe this info could be useful for others :)) > > One of the VSOCK advantages is the simple configuration: you don't need to set > up IP addresses for guest/host, and it can be used with the standard POSIX > socket API. [1] > > I'm currently working on it, so the "optimized" values are still work in > progress and I'll send the patches upstream (Linux) as soon as possible. > (I hope in 1 or 2 weeks) > > Optimizations: > + reducing the number of credit update packets > - RX side sent, on every packet received, an empty packet only to inform the > TX side about the space in the RX buffer. > + increase RX buffers size to 64 KB (from 4 KB) > + merge packets to fill RX buffers > > As benchmark tool I used iperf3 [2] modified with VSOCK support: > > host -> guest [Gbps] guest -> host [Gbps] > pkt_size before opt. optimized before opt. optimized > 1K 0.5 1.6 1.4 1.4
This is a "large" small package size. I think 64 bytes is a common "small" packet size and is worth benchmarking too. > 2K 1.1 3.1 2.3 2.5 > 4K 2.0 5.6 4.2 4.4 > 8K 3.2 10.2 7.2 7.5 > 16K 6.4 14.2 9.4 11.3 > 32K 9.8 18.9 9.2 17.8 > 64K 13.8 22.9 8.8 25.0 > 128K 17.6 24.5 7.7 25.7 > 256K 19.0 24.8 8.1 25.6 > 512K 20.8 25.1 8.1 25.4 Nice improvements! Stefan
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