On Mon, Mar 22, 2021 at 07:23:14PM -0700, Jiang Wang . wrote: > Got it. Will do. You could look at udp_sendmsg() to see how sockets compete when transmitting to the same net device. I'm not very familiar with this but I guess that the qdisc (like fq_codel) decides which packets to place into the device's tx queue. I guess sk_buffs waiting to be put onto the device's tx queue are accounted for against the socket's sndbuf. Further sendmsg calls will fail with -ENOBUFS when the sndbuf limit is reached. It's not clear to me how much of the existing code can be reused since vsock does not use sk_buff or netdev :(. Stefan
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