Messages in this thread | | | Date | Wed, 04 Mar 2009 01:39:37 -0800 (PST) | Subject | Re: [RFC v1] hand off skb list to other cpu to submit to upper layer | From | David Miller <> |
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From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> Date: Wed, 04 Mar 2009 17:27:48 +0800
> Both the new skb_record_rx_queue and current kernel have an > assumption on multi-queue. The assumption is it's best to send out > packets from the TX of the same number of queue like the one of RX > if the receved packets are related to the out packets. Or more > direct speaking is we need send packets on the same cpu on which we > receive them. The start point is that could reduce skb and data > cache miss.
We have to use the same TX queue for all packets for the same connection flow (same src/dst IP address and ports) otherwise we introduce reordering.
Herbert brought this up, now I have explicitly brought this up, and you cannot ignore this issue.
You must not knowingly reorder packets, and using different TX queues for packets within the same flow does that.
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