netdev - Re: [PATCH 1/1] tun: change speed from 10M to dynamically configured

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Message-ID: <54DD70D5.5050800@windriver.com>
Date:	Fri, 13 Feb 2015 11:34:45 +0800
From:	yzhu1 <Yanjun.Zhu@...driver.com>
To:	Fan Du <fengyuleidian0615@...il.com>
CC:	Stephen Hemminger <stephen@...workplumber.org>,
	<netdev@...r.kernel.org>, <mst@...hat.com>, <jasowang@...hat.com>,
	<viro@...iv.linux.org.uk>, <davem@...emloft.net>
Subject: Re: [PATCH 1/1] tun: change speed from 10M to dynamically configured

On 02/13/2015 11:25 AM, Fan Du wrote:
> 于 2015年02月13日 10:45, yzhu1 写道:
>> On 02/12/2015 08:55 PM, Stephen Hemminger wrote:
>>> On Thu, 12 Feb 2015 13:35:23 +0800
>>> Zhu Yanjun <Yanjun.Zhu@...driver.com> wrote:
>>>
>>>> From: Zhu Yanjun <yanjun.zhu@...driver.com>
>>>>
>>>> The default speed of normal nic is 1000M while the default speed
>>>> of tun is 10M. Now the default speed of tun is changed to 1000M.
>>>> And there are 3 options: 10M, 100M and 1000M to the speed of tun.
>>>> The command "ethtool -s tun0 speed 10/100/1000" can configure the
>>>> speed of tun dynamically.
>>>>
>>>> CC: Michael S. Tsirkin <mst@...hat.com>
>>>> CC: Jason Wang <jasowang@...hat.com>
>>>> CC: Al Viro <viro@...iv.linux.org.uk>
>>>> Signed-off-by: Zhu Yanjun <yanjun.zhu@...driver.com>
>>>> Signed-off-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
>>> Why limit to 10/100/1000 speed?
>>> Ethtool speed can be any value
>> Thanks for your comments.
>>
>> Yes. But the real physical nic speed often 10M, 100M and 1000M.
>> This simulates the physical nic.
>    ^^^^^^^^^^^^^^^
> then a speed control logical would be needed to effect the 
> corresponding speed
> when tun/tap gets/puts packets corresponding to the speed setting.
>
> What's the benefit when changing speed from 10Mb/s to 1000Mb/s?
>
> Just xia bibi ;)
:-P
Thanks for your reply.

This speed is just for user space application. There is no any speed 
control logic here.:-(

Zhu Yanjun

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