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

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Message-ID: <54DD6EBC.2030203@gmail.com>
Date:	Fri, 13 Feb 2015 11:25:48 +0800
From:	Fan Du <fengyuleidian0615@...il.com>
To:	yzhu1 <Yanjun.Zhu@...driver.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

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 ;)


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