netdev - Re: tun mq failure

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Date:	Wed, 23 Jan 2013 21:20:41 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	netdev@...r.kernel.org
Subject: Re: tun mq failure

On 01/23/2013 09:18 PM, Michael S. Tsirkin wrote:
> On Wed, Jan 23, 2013 at 08:08:07PM +0800, Jason Wang wrote:
>> On 01/23/2013 07:06 PM, Hannes Frederic Sowa wrote:
>>> On Wed, Jan 23, 2013 at 12:05:16PM +0200, Michael S. Tsirkin wrote:
>>>> This is when trying to start a VPN using some old openvpn binary so MQ
>>>> is not set.
>>>>
>>>> So
>>>> 1. I think we should limit allocation of MQ to when MQ flag is set in SETIFF.
>>>> 2. order 7 allocation is 2^^7 pages - about half a megabyte of contigious
>>>>    memory. This is quite likely to fail.
>>>>    Let's start with a small limit on number of queues, like 8?
>>>>    Then we know it will succeed.
>>>>    Longer term we might want to solve it differently.
>>> This has been come up before:
>>> http://thread.gmane.org/gmane.linux.network/255647/focus=255902
>>>
>>> I think a solution to this problem is still outstanding.
>>>
>> I draft a patch in the reply of in that thread, but didn't get feedback
>> from reporter.
> Yes it's essentialy same.
> So can you please submit an official patch with proper
> subject commit log and signature?

Ok, will post the patch soon.
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