netdev - Re: [net-next rfc 1/3] net: avoid high order memory allocation for queues by using flex array

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Message-ID: <1371708312.3252.359.camel@edumazet-glaptop>
Date:	Wed, 19 Jun 2013 23:05:12 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, davem@...emloft.net,
	edumazet@...gle.com, hkchu@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [net-next rfc 1/3] net: avoid high order memory allocation for
 queues by using flex array

On Thu, 2013-06-20 at 13:14 +0800, Jason Wang wrote:

> A drawback of NETIF_F_LLTX is that we may contend on qdisc lock
> especially when we have a huge number of tx queues.

For your information loopback driver is LLTX, and there is no qdisc on
it, unless you specifically add one.

Once you add a qdisc on a device, you hit the typical contention on a
spinlock. But its hard to design a parallel qdisc. So far nobody did
that.



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