linux-kernel - Re: [PATCH net-net 0/4] Increase the limit of tuntap queues

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Message-ID: <CAADnVQKs6Y-47TuxFedT2Xi6OUAJqwGFKhip40cbVewmtw10wQ@mail.gmail.com>
Date:	Tue, 18 Nov 2014 17:43:06 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Pankaj Gupta <pagupta@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>, mst@...hat.com,
	dgibson@...hat.com, Veaceslav Falico <vfalico@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Vladislav Yasevich <vyasevic@...hat.com>,
	Jerry Chu <hkchu@...gle.com>,
	wuzhy@...ux.vnet.ibm.com.pnq.redhat.com,
	Pavel Emelianov <xemul@...allels.com>,
	Tom Herbert <therbert@...gle.com>, bhutchings@...arflare.com,
	xii@...gle.com, Stephen Hemminger <stephen@...workplumber.org>,
	Jiří Pírko <jiri@...nulli.us>,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH net-net 0/4] Increase the limit of tuntap queues

On Tue, Nov 18, 2014 at 8:22 AM, 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.
...
> I have done some testing to find out any regression and with sample program
>  which creates tun/tap for single queue / multiqueue device and it seems to be
>  working fine. I will also post the performance numbers.

Sounds quite exciting.
please share recommended setup (queue assignments) and
performance gains you're seeing.
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