netdev - Re: [PATCH v2] net-tcp: TCP/IP stack bypass for loopback connections

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Date:	Sun, 9 Sep 2012 19:54:42 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Pádraig Brady <P@...igBrady.com>,
	"Bruce \"Brutus\" Curtis" <brutus@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net-tcp: TCP/IP stack bypass for loopback
 connections


On Thursday 2012-08-23 13:40, Eric Dumazet wrote:
>On Thu, 2012-08-23 at 11:57 +0100, Pádraig Brady wrote:
>
>> Just to quantify the loopback testing compat issue.
>> I often do stuff like the following to test latency.
>> Will that be impacted?
>> 
>>   tc qdisc add dev lo root handle 1:0 netem delay 20msec
>> 
>
>Yes this will. At least for tcp traffic this wont "work".
>
>TCP friends bypass layers, by directly queuing skbs to sockets.
>
>-> no iptables, 

If it amounts to that, you will have upset users rather soon.
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