netdev - Re: [PATCH RFC] net: decrease the length of backlog queue immediately after it's detached from sk

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Message-ID: <1460040665.6473.398.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 07 Apr 2016 07:51:05 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Ding Tianhong <dingtianhong@...wei.com>
Subject: Re: [PATCH RFC] net: decrease the length of backlog queue
 immediately after it's detached from sk

On Thu, 2016-04-07 at 03:21 -0700, Eric Dumazet wrote:

> Please do not send patches before really understanding the issue you
> have.
> 
> Having a backlog of 12506206 bytes is ridiculous. Dropping packets is
> absolutely fine if this ever happens.
> 
> Something is really wrong on your host, or the sender simply does not
> comply with TCP protocol (not caring of receiver window at all)
> 
> Since you added a trace of truesize, please also trace skb->len
> 

BTW, have you played with /proc/sys/net/ipv4/tcp_adv_win_scale ?