netdev - Re: [PATCH net-next] tcp: inherit listener congestion control for passive cnx

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Message-ID: <4ED6A019.2040708@hp.com>
Date:	Wed, 30 Nov 2011 13:28:57 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Yuchung Cheng <ycheng@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH net-next] tcp: inherit listener congestion control for
 passive cnx

>
> Rick Jones reported that TCP_CONGESTION sockopt performed on a listener
> was ignored for its children sockets : right after accept() the
> congestion control for new socket is the system default one.
>
> This seems an oversight of the initial design (quoted from Stephen)
>
> Based on prior investigation and patch from Rick.
>
> Reported-by: Rick Jones<rick.jones2@...com>
> Signed-off-by: Eric Dumazet<eric.dumazet@...il.com>
> CC: Stephen Hemminger<shemminger@...tta.com>
> CC: Yuchung Cheng<ycheng@...gle.com>

Tested-by: Rick Jones <rick.jones2@...com>

Works as expected/desired with my test program, and doesn't appear to 
affect performance measurably (loopback netperf TCP_CC test on a 1 VCPU 
guest).

rick jones
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