linux-kernel - Re: [PATCH net-next] virtio-net: enable multiqueue by default

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Date:   Mon, 28 Nov 2016 13:18:05 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, hannes@...hat.com, mst@...hat.com,
        nhorman@...hat.com, jeder@...hat.com, myllynen@...hat.com,
        maxime.coquelin@...hat.com
Subject: Re: [PATCH net-next] virtio-net: enable multiqueue by default

From: Jason Wang <jasowang@...hat.com>
Date: Fri, 25 Nov 2016 12:37:26 +0800

> We use single queue even if multiqueue is enabled and let admin to
> enable it through ethtool later. This is used to avoid possible
> regression (small packet TCP stream transmission). But looks like an
> overkill since:
> 
> - single queue user can disable multiqueue when launching qemu
> - brings extra troubles for the management since it needs extra admin
>   tool in guest to enable multiqueue
> - multiqueue performs much better than single queue in most of the
>   cases
> 
> So this patch enables multiqueue by default: if #queues is less than or
> equal to #vcpu, enable as much as queue pairs; if #queues is greater
> than #vcpu, enable #vcpu queue pairs.
> 
> Cc: Hannes Frederic Sowa <hannes@...hat.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Neil Horman <nhorman@...hat.com>
> Cc: Jeremy Eder <jeder@...hat.com>
> Cc: Marko Myllynen <myllynen@...hat.com>
> Cc: Maxime Coquelin <maxime.coquelin@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks Jason.