netdev - Re: [RFC 4/4] tuntap: Increase the number of queues in tun

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Date:	Mon, 25 Aug 2014 11:37:40 +1000
From:	David Gibson <dgibson@...hat.com>
To:	Pankaj Gupta <pagupta@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net, jasowang@...hat.com, mst@...hat.com,
	vfalico@...il.com, edumazet@...gle.com, vyasevic@...hat.com,
	hkchu@...gle.com, wuzhy@...ux.vnet.ibm.com, xemul@...allels.com,
	therbert@...gle.com, bhutchings@...arflare.com, xii@...gle.com,
	stephen@...workplumber.org
Subject: Re: [RFC 4/4] tuntap: Increase the number of queues in tun

On Mon, 18 Aug 2014 19:07:20 +0530
Pankaj Gupta <pagupta@...hat.com> wrote:

> Networking under kvm works best if we allocate a per-vCPU RX and TX
> queue in a virtual NIC. This requires a per-vCPU queue on the host side.
> 
> It is now safe to increase the maximum number of queues.
> Preceding patches:
> 	net: allow large number of rx queues
>   	tuntap: Reduce the size of tun_struct by using flex array
> 	tuntap: Publish tuntap max queue length as module_param
> 
> 	made sure this won't cause failures due to high order memory
> allocations. Increase it to 256: this is the max number of vCPUs
> KVM supports.
> 
> Signed-off-by: Pankaj Gupta <pagupta@...hat.com>

Reviewed-by: David Gibson <dgibson@...hat.com>

-- 
David Gibson <dgibson@...hat.com>

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