Re: [PATCH net-next 2/2] virtio-net: simplify XDP handling in small buffer
From: Jesper Dangaard Brouer <hidden>
Date: 2018-03-01 09:16:14
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On Thu, 1 Mar 2018 16:49:24 +0800 Jason Wang [off-list ref] wrote:
quoted
2. This can easily cause out-of-order packets.I may miss something, but it looks to me packets were still delivered in order? Or you mean the packets that was dropped by cpumap?
No. Packets can now travel two code paths to the egress device. (1) XDP native via ndp_xdp_xmit via direct delivery into a lockfree/dedicated TX queue, (2) via normal network stack which can involve being queue in a qdisc. Do you see the possibility of the reorder now? -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer