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Date: Thu, 15 Dec 2011 19:54:37 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: Rick Jones <rick.jones2@...com> Cc: Vijay Subramanian <subramanian.vijay@...il.com>, tcpdump-workers@...ts.tcpdump.org, netdev@...r.kernel.org Subject: Re: twice past the taps, thence out to net? Le jeudi 15 décembre 2011 à 10:32 -0800, Rick Jones a écrit : > > More exactly, we call dev_queue_xmit_nit() from dev_hard_start_xmit() > > _before_ giving skb to device driver. > > > > If device driver returns NETDEV_TX_BUSY, and a qdisc was setup on the > > device, packet is requeued. > > > > Later, when queue is allowed to send again packets, packet is > > retransmitted (and traced a second time in dev_queue_xmit_nit()) > > Is this then an unintended consequence bug, or a known feature? > Its a well known feature, some people attempted to remove it ;) http://answers.softpicks.net/answers/topic/-PATCH-tcpdump-may-trace-some-outbound-packets-twice--2204640-1.htm -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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