netdev - Re: [patch v4, kernel version 3.2.1] net/ipv4/ip

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Date:	Thu, 26 Jan 2012 11:57:30 +0100
From:	Štefan Gula <steweg@...t.sk>
To:	David Miller <davem@...emloft.net>
Cc:	jesse@...ira.com, joseph.glanville@...onvm.com.au,
	eric.dumazet@...il.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

2012/1/26 David Miller <davem@...emloft.net>:
> From: Štefan Gula <steweg@...t.sk>
> Date: Wed, 25 Jan 2012 23:57:18 +0100
>
>> The performance is one of the most critical thing why I have chosen to
>> build kernel patch in the first place instead of some user-space app.
>> If I used this approach, I would probably end up with patch for
>> OpenVPN project instead in that time. I am not telling that
>> openvswitch is not a good place for prototyping, but I believe that
>> this patch is beyond that border as it successfully run in environment
>> with more 98 linux-based APs, used for 4K+ users, with no issue for
>> more than 2 years. The performance results from Joseph Glanville even
>> adds value to it. So I still don't get the point, why my patch and
>> openvswitch cannot coexists in the kernel together and let user/admin
>> to choose to correct solution for him/her.
>
> You don't even know if openvswitch could provide acceptable levels
> of performance, because you haven't even tried.
>
> I'm not applying your patch.
Performance of any user-space application is lower than performance of
something running purely inside the kernel-space only. So still don't
see any valid reason, why it simply cannot coexists as it doesn't
breaks any existing functionality at all?
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