On Mon, Feb 24, 2020 at 5:01 AM <[email protected]> wrote: > > From: Yi Yang <[email protected]> > > We can avoid high system call overhead by using TPACKET_V3 > and using DPDK-like poll to receive and send packets (Note: send > still needs to call sendto to trigger final packet transmission). > > From Linux kernel 3.10 on, TPACKET_V3 has been supported, > so all the Linux kernels current OVS supports can run > TPACKET_V3 without any problem. > > I can see about 30% performance improvement for veth compared to > last recvmmsg optimization if I use TPACKET_V3, it is about 1.98 > Gbps, but it was 1.47 Gbps before. > > TPACKET_V3 can support TSO, it can work only if your kernel can > support, this has been verified on Ubuntu 18.04 5.3.0-40-generic > , if you find the performance is very poor, please turn off tso > for veth interfces in case userspace-tso-enable is set to true.
Do you test the performance of enabling TSO? Using veth (like your run-iperf3.sh) and with kernel 5.3. Without your patch, with TSO enabled, I can get around 6Gbps But with this patch, with TSO enabled, the performance drops to 1.9Gbps. Regards, William _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
