netdev - Re: [PATCH]: Add Network Sysrq Support

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Message-ID: <4E01DDD5.8020707@redhat.com>
Date:	Wed, 22 Jun 2011 08:19:33 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Florian Westphal <fw@...len.de>
CC:	David Miller <davem@...emloft.net>, fbl@...hat.com,
	netdev@...r.kernel.org, agospoda@...hat.com, nhorman@...hat.com,
	lwoodman@...hat.com, john.haxby@...cle.com
Subject: Re: [PATCH]: Add Network Sysrq Support



On 06/22/2011 06:54 AM, Florian Westphal wrote:
> Prarit Bhargava <prarit@...hat.com> wrote:
>
> [ cc'd John Haxby, who worked on xt_SYSREQ ]
>
>   
>> On 06/21/2011 06:58 PM, David Miller wrote:
>>     
>>> From: Florian Westphal <fw@...len.de>
>>> Date: Wed, 22 Jun 2011 00:56:45 +0200
>>>       
>>>> This is one of the reasons why I still think that
>>>> xt_SYSREQ would be the better solution, you get all
>>>> kinds of filtering features for free.
>>>>
>>>> You could even use crazy things like '-m time' to restrict
>>>> sysreq availability to working hours and whatnot.
>>>>
>>>>         
>>> Agreed.
>>>       
>> Using the netfilter xt-SYSRQ code seems to store the entered code and
>> execute it later after the system has returned to a normal state....
>> which is much too late to be useful.
>>     
> The target handler of the kernel part invokes handle_sysrq(),
> I don't see any delaying/queueing?
>   

Yeah ... It just occurred to me on the way into the office that I made a
mistake.

... What if the "slow down" I'm seeing is due to the network layer?  ...
but why would ping work and the xt_SYSRQ not work? 

Either way ... I have a feeling that I'm on to something,

P.

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