netdev - Re: tun mq failure

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Message-ID: <20130123110640.GC7005@order.stressinduktion.org>
Date:	Wed, 23 Jan 2013 12:06:40 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org
Subject: Re: tun mq failure

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.

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