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

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Date:	Mon, 11 Apr 2016 05:13:48 -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 Mon, 2016-04-11 at 19:57 +0800, Yang Yingliang wrote:
> 
> On 2016/4/8 22:44, Eric Dumazet wrote:
> > On Fri, 2016-04-08 at 19:18 +0800, Yang Yingliang wrote:
> >
> >> I expand  tcp_adv_win_scale and tcp_rmem. It has no effect.
> >
> > Try :
> >
> > echo -2 >/proc/sys/net/ipv4/tcp_adv_win_scale
> >
> > And restart your flows.
> >
> cat /proc/sys/net/ipv4/tcp_rmem
> 10240 2097152 10485760

What about leaving the default values ?

$ cat /proc/sys/net/ipv4/tcp_rmem
4096	87380	6291456

> 
> echo 102400 20971520 104857600 > /proc/sys/net/ipv4/tcp_rmem
> echo -2 >/proc/sys/net/ipv4/tcp_adv_win_scale
> 
> It seems has not effect.
> 

I have no idea what you did on the sender side to allow it to send more
than 1.5 MB then.