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

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Date:	Tue, 12 Apr 2016 10:59:15 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.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 2016/4/11 20:13, Eric Dumazet wrote:
> 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 ?
I tried, it did not work.

>
> $ 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.

We are doing performance test. The sender send 256KB per-block with 128
threads to one socket. And the receiver uses 10Gb NIC to handle the
data on ARM64. The data flow is driver->ip layer->tcp layer->iscsi.

I added some debug messages and found handling backlog packets in 
__release_sock() cost about 11ms at most. This can cause backlog queue
overflow. The sk_data_ready is re-assigned, it may cost time in our
program. I will check it out.